/etc/exim4/exim4.conf.template is in exim4-config 4.90.1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 | #####################################################
### main/01_exim4-config_listmacrosdefs
#####################################################
######################################################################
# Runtime configuration file for Exim 4 (Debian Packaging) #
######################################################################
######################################################################
# /etc/exim4/exim4.conf.template is only used with the non-split
# configuration scheme.
# /etc/exim4/conf.d/main/01_exim4-config_listmacrosdefs is only used
# with the split configuration scheme.
# If you find this comment anywhere else, somebody copied it there.
# Documentation about the Debian exim4 configuration scheme can be
# found in /usr/share/doc/exim4-base/README.Debian.gz.
######################################################################
######################################################################
# MAIN CONFIGURATION SETTINGS #
######################################################################
# Just for reference and scripts.
# On Debian systems, the main binary is installed as exim4 to avoid
# conflicts with the exim 3 packages.
exim_path = /usr/sbin/exim4
# Macro defining the main configuration directory.
# We do not use absolute paths.
.ifndef CONFDIR
CONFDIR = /etc/exim4
.endif
# debconf-driven macro definitions get inserted after this line
UPEX4CmacrosUPEX4C = 1
# Create domain and host lists for relay control
# '@' refers to 'the name of the local host'
# List of domains considered local for exim. Domains not listed here
# need to be deliverable remotely.
domainlist local_domains = MAIN_LOCAL_DOMAINS
# List of recipient domains to relay _to_. Use this list if you're -
# for example - fallback MX or mail gateway for domains.
domainlist relay_to_domains = MAIN_RELAY_TO_DOMAINS
# List of sender networks (IP addresses) to _unconditionally_ relay
# _for_. If you intend to be SMTP AUTH server, you do not need to enter
# anything here.
hostlist relay_from_hosts = MAIN_RELAY_NETS
# Decide which domain to use to add to all unqualified addresses.
# If MAIN_PRIMARY_HOSTNAME_AS_QUALIFY_DOMAIN is defined, the primary
# hostname is used. If not, but MAIN_QUALIFY_DOMAIN is set, the value
# of MAIN_QUALIFY_DOMAIN is used. If both macros are not defined,
# the first line of /etc/mailname is used.
.ifndef MAIN_PRIMARY_HOSTNAME_AS_QUALIFY_DOMAIN
.ifndef MAIN_QUALIFY_DOMAIN
qualify_domain = ETC_MAILNAME
.else
qualify_domain = MAIN_QUALIFY_DOMAIN
.endif
.endif
# listen on all all interfaces?
.ifdef MAIN_LOCAL_INTERFACES
local_interfaces = MAIN_LOCAL_INTERFACES
.endif
.ifndef LOCAL_DELIVERY
# The default transport, set in /etc/exim4/update-exim4.conf.conf,
# defaulting to mail_spool. See CONFDIR/conf.d/transport/ for possibilities
LOCAL_DELIVERY=mail_spool
.endif
# The gecos field in /etc/passwd holds not only the name. see passwd(5).
gecos_pattern = ^([^,:]*)
gecos_name = $1
# define macros to be used in acl/30_exim4-config_check_rcpt to check
# recipient local parts for strange characters.
# This macro definition really should be in
# acl/30_exim4-config_check_rcpt but cannot be there due to
# http://www.exim.org/bugzilla/show_bug.cgi?id=101 as of exim 4.62.
# These macros are documented in acl/30_exim4-config_check_rcpt,
# can be changed here or overridden by a locally added configuration
# file as described in README.Debian section "Using Exim Macros to control
# the configuration".
.ifndef CHECK_RCPT_LOCAL_LOCALPARTS
CHECK_RCPT_LOCAL_LOCALPARTS = ^[.] : ^.*[@%!/|`#&?]
.endif
.ifndef CHECK_RCPT_REMOTE_LOCALPARTS
CHECK_RCPT_REMOTE_LOCALPARTS = ^[./|] : ^.*[@%!`#&?] : ^.*/\\.\\./
.endif
# always log tls_peerdn as we use TLS for outgoing connects by default
.ifndef MAIN_LOG_SELECTOR
MAIN_LOG_SELECTOR = +smtp_protocol_error +smtp_syntax_error +tls_certificate_verified +tls_peerdn
.endif
#####################################################
### end main/01_exim4-config_listmacrosdefs
#####################################################
#####################################################
### main/02_exim4-config_options
#####################################################
### main/02_exim4-config_options
#################################
# Defines the access control list that is run when an
# SMTP MAIL command is received.
#
.ifndef MAIN_ACL_CHECK_MAIL
MAIN_ACL_CHECK_MAIL = acl_check_mail
.endif
acl_smtp_mail = MAIN_ACL_CHECK_MAIL
# Defines the access control list that is run when an
# SMTP RCPT command is received.
#
.ifndef MAIN_ACL_CHECK_RCPT
MAIN_ACL_CHECK_RCPT = acl_check_rcpt
.endif
acl_smtp_rcpt = MAIN_ACL_CHECK_RCPT
# Defines the access control list that is run when an
# SMTP DATA command is received.
#
.ifndef MAIN_ACL_CHECK_DATA
MAIN_ACL_CHECK_DATA = acl_check_data
.endif
acl_smtp_data = MAIN_ACL_CHECK_DATA
# Message size limit. The default (used when MESSAGE_SIZE_LIMIT
# is unset) is 50 MB
.ifdef MESSAGE_SIZE_LIMIT
message_size_limit = MESSAGE_SIZE_LIMIT
.endif
# If you are running exim4-daemon-heavy or a custom version of Exim that
# was compiled with the content-scanning extension, you can cause incoming
# messages to be automatically scanned for viruses. You have to modify the
# configuration in two places to set this up. The first of them is here,
# where you define the interface to your scanner. This example is typical
# for ClamAV; see the manual for details of what to set for other virus
# scanners. The second modification is in the acl_check_data access
# control list.
# av_scanner = clamd:/var/run/clamav/clamd.ctl
# For spam scanning, there is a similar option that defines the interface to
# SpamAssassin. You do not need to set this if you are using the default, which
# is shown in this commented example. As for virus scanning, you must also
# modify the acl_check_data access control list to enable spam scanning.
# spamd_address = 127.0.0.1 783
# Domain used to qualify unqualified recipient addresses
# If this option is not set, the qualify_domain value is used.
# qualify_recipient = <value of qualify_domain>
# Allow Exim to recognize addresses of the form "user@[10.11.12.13]",
# where the domain part is a "domain literal" (an IP address) instead
# of a named domain. The RFCs require this facility, but it is disabled
# in the default config since it is rarely used and frequently abused.
# Domain literal support also needs a special router, which is automatically
# enabled if you use the enable macro MAIN_ALLOW_DOMAIN_LITERALS.
# Additionally, you might want to make your local IP addresses (or @[])
# local domains.
.ifdef MAIN_ALLOW_DOMAIN_LITERALS
allow_domain_literals
.endif
# Do a reverse DNS lookup on all incoming IP calls, in order to get the
# true host name. If you feel this is too expensive, the networks for
# which a lookup is done can be listed here.
.ifndef DC_minimaldns
.ifndef MAIN_HOST_LOOKUP
MAIN_HOST_LOOKUP = *
.endif
host_lookup = MAIN_HOST_LOOKUP
.endif
# In a minimaldns setup, update-exim4.conf guesses the hostname and
# dumps it here to avoid DNS lookups being done at Exim run time.
.ifdef MAIN_HARDCODE_PRIMARY_HOSTNAME
primary_hostname = MAIN_HARDCODE_PRIMARY_HOSTNAME
.endif
# The settings below cause Exim to make RFC 1413 (ident) callbacks
# for all incoming SMTP calls. You can limit the hosts to which these
# calls are made, and/or change the timeout that is used. If you set
# the timeout to zero, all RFC 1413 calls are disabled. RFC 1413 calls
# are cheap and can provide useful information for tracing problem
# messages, but some hosts and firewalls have problems with them.
# This can result in a timeout instead of an immediate refused
# connection, leading to delays on starting up SMTP sessions.
# (The default was reduced from 30s to 5s for release 4.61. and to
# disabled for release 4.86)
#
#rfc1413_hosts = *
#rfc1413_query_timeout = 5s
# Enable an efficiency feature. We advertise the feature; clients
# may request to use it. For multi-recipient mails we then can
# reject or accept per-user after the message is received.
#
prdr_enable = true
# When using an external relay tester (such as rt.njabl.org and/or the
# currently defunct relay-test.mail-abuse.org, the test may be aborted
# since exim complains about "too many nonmail commands". If you want
# the test to complete, add the host from where "your" relay tester
# connects from to the MAIN_SMTP_ACCEPT_MAX_NOMAIL_HOSTS macro.
# Please note that a non-empty setting may cause extra DNS lookups to
# happen, which is the reason why this option is commented out in the
# default settings.
# MAIN_SMTP_ACCEPT_MAX_NOMAIL_HOSTS = !rt.njabl.org
.ifdef MAIN_SMTP_ACCEPT_MAX_NOMAIL_HOSTS
smtp_accept_max_nonmail_hosts = MAIN_SMTP_ACCEPT_MAX_NOMAIL_HOSTS
.endif
# By default, exim forces a Sender: header containing the local
# account name at the local host name in all locally submitted messages
# that don't have the local account name at the local host name in the
# From: header, deletes any Sender: header present in the submitted
# message and forces the envelope sender of all locally submitted
# messages to the local account name at the local host name.
# The following settings allow local users to specify their own envelope sender
# in a locally submitted message. Sender: headers existing in a locally
# submitted message are not removed, and no automatic Sender: headers
# are added. These settings are fine for most hosts.
# If you run exim on a classical multi-user systems where all users
# have local mailboxes that can be reached via SMTP from the Internet
# with the local FQDN as the domain part of the address, you might want
# to disable the following three lines for traceability reasons.
.ifndef MAIN_FORCE_SENDER
local_from_check = false
local_sender_retain = true
untrusted_set_sender = *
.endif
# By default, Exim expects all envelope addresses to be fully qualified, that
# is, they must contain both a local part and a domain. Configure exim
# to accept unqualified addresses from certain hosts. When this is done,
# unqualified addresses are qualified using the settings of qualify_domain
# and/or qualify_recipient (see above).
# sender_unqualified_hosts = <unset>
# recipient_unqualified_hosts = <unset>
# Configure Exim to support the "percent hack" for certain domains.
# The "percent hack" is the feature by which mail addressed to x%y@z
# (where z is one of the domains listed) is locally rerouted to x@y
# and sent on. If z is not one of the "percent hack" domains, x%y is
# treated as an ordinary local part. The percent hack is rarely needed
# nowadays but frequently abused. You should not enable it unless you
# are sure that you really need it.
# percent_hack_domains = <unset>
# Bounce handling
.ifndef MAIN_IGNORE_BOUNCE_ERRORS_AFTER
MAIN_IGNORE_BOUNCE_ERRORS_AFTER = 2d
.endif
ignore_bounce_errors_after = MAIN_IGNORE_BOUNCE_ERRORS_AFTER
.ifndef MAIN_TIMEOUT_FROZEN_AFTER
MAIN_TIMEOUT_FROZEN_AFTER = 7d
.endif
timeout_frozen_after = MAIN_TIMEOUT_FROZEN_AFTER
.ifndef MAIN_FREEZE_TELL
MAIN_FREEZE_TELL = postmaster
.endif
freeze_tell = MAIN_FREEZE_TELL
# Define spool directory
.ifndef SPOOLDIR
SPOOLDIR = /var/spool/exim4
.endif
spool_directory = SPOOLDIR
# trusted users can set envelope-from to arbitrary values
.ifndef MAIN_TRUSTED_USERS
MAIN_TRUSTED_USERS = uucp
.endif
trusted_users = MAIN_TRUSTED_USERS
.ifdef MAIN_TRUSTED_GROUPS
trusted_groups = MAIN_TRUSTED_GROUPS
.endif
# users in admin group can do many other things
# admin_groups = <unset>
# SMTP Banner. The example includes the Debian version in the SMTP dialog
# MAIN_SMTP_BANNER = "${primary_hostname} ESMTP Exim ${version_number} (Debian package MAIN_PACKAGE_VERSION) ${tod_full}"
# smtp_banner = $smtp_active_hostname ESMTP Exim $version_number $tod_full
.ifdef MAIN_KEEP_ENVIRONMENT
keep_environment = MAIN_KEEP_ENVIRONMENT
.else
# set option to empty value to avoid warning.
keep_environment =
.endif
.ifdef MAIN_ADD_ENVIRONMENT
add_environment = MAIN_ADD_ENVIRONMENT
.endif
#####################################################
### end main/02_exim4-config_options
#####################################################
#####################################################
### main/03_exim4-config_tlsoptions
#####################################################
### main/03_exim4-config_tlsoptions
#################################
# TLS/SSL configuration for exim as an SMTP server.
# See /usr/share/doc/exim4-base/README.Debian.gz for explanations.
.ifdef MAIN_TLS_ENABLE
# Defines what hosts to 'advertise' STARTTLS functionality to. The
# default, *, will advertise to all hosts that connect with EHLO.
.ifndef MAIN_TLS_ADVERTISE_HOSTS
MAIN_TLS_ADVERTISE_HOSTS = *
.endif
tls_advertise_hosts = MAIN_TLS_ADVERTISE_HOSTS
# Full paths to Certificate and Private Key. The Private Key file
# must be kept 'secret' and should be owned by root.Debian-exim mode
# 640 (-rw-r-----). exim-gencert takes care of these prerequisites.
# Normally, exim4 looks for certificate and key in different files:
# MAIN_TLS_CERTIFICATE - path to certificate file,
# CONFDIR/exim.crt if unset
# MAIN_TLS_PRIVATEKEY - path to private key file
# CONFDIR/exim.key if unset
# You can also configure exim to look for certificate and key in the
# same file, set MAIN_TLS_CERTKEY to that file to enable. This takes
# precedence over all other settings regarding certificate and key file.
.ifdef MAIN_TLS_CERTKEY
tls_certificate = MAIN_TLS_CERTKEY
.else
.ifndef MAIN_TLS_CERTIFICATE
MAIN_TLS_CERTIFICATE = CONFDIR/exim.crt
.endif
tls_certificate = MAIN_TLS_CERTIFICATE
.ifndef MAIN_TLS_PRIVATEKEY
MAIN_TLS_PRIVATEKEY = CONFDIR/exim.key
.endif
tls_privatekey = MAIN_TLS_PRIVATEKEY
.endif
# Pointer to the CA Certificates against which client certificates are
# checked. This is controlled by the `tls_verify_hosts' and
# `tls_try_verify_hosts' lists below.
# If you want to check server certificates, you need to add an
# tls_verify_certificates statement to the smtp transport.
# /etc/ssl/certs/ca-certificates.crt is generated by
# the "ca-certificates" package's update-ca-certificates(8) command.
.ifndef MAIN_TLS_VERIFY_CERTIFICATES
MAIN_TLS_VERIFY_CERTIFICATES = ${if exists{/etc/ssl/certs/ca-certificates.crt}\
{/etc/ssl/certs/ca-certificates.crt}\
{/dev/null}}
.endif
tls_verify_certificates = MAIN_TLS_VERIFY_CERTIFICATES
# A list of hosts which are constrained by `tls_verify_certificates'. A host
# that matches `tls_verify_host' must present a certificate that is
# verifyable through `tls_verify_certificates' in order to be accepted as an
# SMTP client. If it does not, the connection is aborted.
.ifdef MAIN_TLS_VERIFY_HOSTS
tls_verify_hosts = MAIN_TLS_VERIFY_HOSTS
.endif
# A weaker form of checking: if a client matches `tls_try_verify_hosts' (but
# not `tls_verify_hosts'), request a certificate and check it against
# `tls_verify_certificates' but do not abort the connection if there is no
# certificate or if the certificate presented does not match. (This
# condition can be tested for in ACLs through `verify = certificate')
# By default, this check is done for all hosts. It is known that some
# clients (including incredimail's version downloadable in February
# 2008) choke on this. To disable, set MAIN_TLS_TRY_VERIFY_HOSTS to an
# empty value.
.ifdef MAIN_TLS_TRY_VERIFY_HOSTS
tls_try_verify_hosts = MAIN_TLS_TRY_VERIFY_HOSTS
.endif
.ifdef _HAVE_GNUTLS
tls_dhparam = historic
.endif
.else
# Don't advertise TLS if MAIN_TLS_ENABLE is not set.
tls_advertise_hosts =
.endif
#####################################################
### end main/03_exim4-config_tlsoptions
#####################################################
#####################################################
### main/90_exim4-config_log_selector
#####################################################
### main/90_exim4-config_log_selector
#################################
# uncomment this for debugging
# MAIN_LOG_SELECTOR == MAIN_LOG_SELECTOR +all -subject -arguments
.ifdef MAIN_LOG_SELECTOR
log_selector = MAIN_LOG_SELECTOR
.endif
#####################################################
### end main/90_exim4-config_log_selector
#####################################################
#####################################################
### acl/00_exim4-config_header
#####################################################
######################################################################
# ACL CONFIGURATION #
# Specifies access control lists for incoming SMTP mail #
######################################################################
begin acl
#####################################################
### end acl/00_exim4-config_header
#####################################################
#####################################################
### acl/20_exim4-config_local_deny_exceptions
#####################################################
### acl/20_exim4-config_local_deny_exceptions
#################################
# This is used to determine whitelisted senders and hosts.
# It checks for CONFDIR/host_local_deny_exceptions and
# CONFDIR/sender_local_deny_exceptions.
#
# It is meant to be used from some other acl entry.
#
# See exim4-config_files(5) for details.
#
# If the files do not exist, the white list never matches, which is
# the desired behaviour.
#
# The old file names CONFDIR/local_host_whitelist and
# CONFDIR/local_sender_whitelist will continue to be honored for a
# transition period. Their use is deprecated.
acl_local_deny_exceptions:
accept
hosts = ${if exists{CONFDIR/host_local_deny_exceptions}\
{CONFDIR/host_local_deny_exceptions}\
{}}
accept
senders = ${if exists{CONFDIR/sender_local_deny_exceptions}\
{CONFDIR/sender_local_deny_exceptions}\
{}}
accept
hosts = ${if exists{CONFDIR/local_host_whitelist}\
{CONFDIR/local_host_whitelist}\
{}}
accept
senders = ${if exists{CONFDIR/local_sender_whitelist}\
{CONFDIR/local_sender_whitelist}\
{}}
# This hook allows you to hook in your own ACLs without having to
# modify this file. If you do it like we suggest, you'll end up with
# a small performance penalty since there is an additional file being
# accessed. This doesn't happen if you leave the macro unset.
.ifdef LOCAL_DENY_EXCEPTIONS_LOCAL_ACL_FILE
.include LOCAL_DENY_EXCEPTIONS_LOCAL_ACL_FILE
.endif
# this is still supported for a transition period and is deprecated.
.ifdef WHITELIST_LOCAL_DENY_LOCAL_ACL_FILE
.include WHITELIST_LOCAL_DENY_LOCAL_ACL_FILE
.endif
#####################################################
### end acl/20_exim4-config_local_deny_exceptions
#####################################################
#####################################################
### acl/30_exim4-config_check_mail
#####################################################
### acl/30_exim4-config_check_mail
#################################
# This access control list is used for every MAIL command in an incoming
# SMTP message. The tests are run in order until the address is either
# accepted or denied.
#
acl_check_mail:
accept
#####################################################
### end acl/30_exim4-config_check_mail
#####################################################
#####################################################
### acl/30_exim4-config_check_rcpt
#####################################################
### acl/30_exim4-config_check_rcpt
#################################
# This access control list is used for every RCPT command in an incoming
# SMTP message. The tests are run in order until the address is either
# accepted or denied.
#
acl_check_rcpt:
# Accept if the source is local SMTP (i.e. not over TCP/IP). We do this by
# testing for an empty sending host field.
accept
hosts = :
control = dkim_disable_verify
# Do not try to verify DKIM signatures of incoming mail if DC_minimaldns
# or DISABLE_DKIM_VERIFY are set.
.ifdef DC_minimaldns
warn
control = dkim_disable_verify
.else
.ifdef DISABLE_DKIM_VERIFY
warn
control = dkim_disable_verify
.endif
.endif
# The following section of the ACL is concerned with local parts that contain
# certain non-alphanumeric characters. Dots in unusual places are
# handled by this ACL as well.
#
# Non-alphanumeric characters other than dots are rarely found in genuine
# local parts, but are often tried by people looking to circumvent
# relaying restrictions. Therefore, although they are valid in local
# parts, these rules disallow certain non-alphanumeric characters, as
# a precaution.
#
# Empty components (two dots in a row) are not valid in RFC 2822, but Exim
# allows them because they have been encountered. (Consider local parts
# constructed as "firstinitial.secondinitial.familyname" when applied to
# a name without a second initial.) However, a local part starting
# with a dot or containing /../ can cause trouble if it is used as part of a
# file name (e.g. for a mailing list). This is also true for local parts that
# contain slashes. A pipe symbol can also be troublesome if the local part is
# incorporated unthinkingly into a shell command line.
#
# These ACL components will block recipient addresses that are valid
# from an RFC2822 point of view. We chose to have them blocked by
# default for security reasons.
#
# If you feel that your site should have less strict recipient
# checking, please feel free to change the default values of the macros
# defined in main/01_exim4-config_listmacrosdefs or override them from a
# local configuration file.
#
# Two different rules are used. The first one has a quite strict
# default, and is applied to messages that are addressed to one of the
# local domains handled by this host.
# The default value of CHECK_RCPT_LOCAL_LOCALPARTS is defined in
# main/01_exim4-config_listmacrosdefs:
# CHECK_RCPT_LOCAL_LOCALPARTS = ^[.] : ^.*[@%!/|`#&?]
# This blocks local parts that begin with a dot or contain a quite
# broad range of non-alphanumeric characters.
.ifdef CHECK_RCPT_LOCAL_LOCALPARTS
deny
domains = +local_domains
local_parts = CHECK_RCPT_LOCAL_LOCALPARTS
message = restricted characters in address
.endif
# The second rule applies to all other domains, and its default is
# considerably less strict.
# The default value of CHECK_RCPT_REMOTE_LOCALPARTS is defined in
# main/01_exim4-config_listmacrosdefs:
# CHECK_RCPT_REMOTE_LOCALPARTS = ^[./|] : ^.*[@%!`#&?] : ^.*/\\.\\./
# It allows local users to send outgoing messages to sites
# that use slashes and vertical bars in their local parts. It blocks
# local parts that begin with a dot, slash, or vertical bar, but allows
# these characters within the local part. However, the sequence /../ is
# barred. The use of some other non-alphanumeric characters is blocked.
# Single quotes might probably be dangerous as well, but they're
# allowed by the default regexps to avoid rejecting mails to Ireland.
# The motivation here is to prevent local users (or local users' malware)
# from mounting certain kinds of attack on remote sites.
.ifdef CHECK_RCPT_REMOTE_LOCALPARTS
deny
domains = !+local_domains
local_parts = CHECK_RCPT_REMOTE_LOCALPARTS
message = restricted characters in address
.endif
# Accept mail to postmaster in any local domain, regardless of the source,
# and without verifying the sender.
#
accept
.ifndef CHECK_RCPT_POSTMASTER
local_parts = postmaster
.else
local_parts = CHECK_RCPT_POSTMASTER
.endif
domains = +local_domains : +relay_to_domains
# Deny unless the sender address can be verified.
#
# This is disabled by default so that DNSless systems don't break. If
# your system can do DNS lookups without delay or cost, you might want
# to enable this feature.
#
# This feature does not work in smarthost and satellite setups as
# with these setups all domains pass verification. See spec.txt section
# "Access control lists" subsection "Address verification" with the added
# information that a smarthost/satellite setup routes all non-local e-mail
# to the smarthost.
.ifdef CHECK_RCPT_VERIFY_SENDER
deny
message = Sender verification failed
!acl = acl_local_deny_exceptions
!verify = sender
.endif
# Verify senders listed in local_sender_callout with a callout.
#
# In smarthost and satellite setups, this causes the callout to be
# done to the smarthost. Verification will thus only be reliable if the
# smarthost does reject illegal addresses in the SMTP dialog.
deny
!acl = acl_local_deny_exceptions
senders = ${if exists{CONFDIR/local_sender_callout}\
{CONFDIR/local_sender_callout}\
{}}
!verify = sender/callout
# Accept if the message comes from one of the hosts for which we are an
# outgoing relay. It is assumed that such hosts are most likely to be MUAs,
# so we set control=submission to make Exim treat the message as a
# submission. It will fix up various errors in the message, for example, the
# lack of a Date: header line. If you are actually relaying out out from
# MTAs, you may want to disable this. If you are handling both relaying from
# MTAs and submissions from MUAs you should probably split them into two
# lists, and handle them differently.
# Recipient verification is omitted here, because in many cases the clients
# are dumb MUAs that don't cope well with SMTP error responses. If you are
# actually relaying out from MTAs, you should probably add recipient
# verification here.
# Note that, by putting this test before any DNS black list checks, you will
# always accept from these hosts, even if they end up on a black list. The
# assumption is that they are your friends, and if they get onto black
# list, it is a mistake.
accept
hosts = +relay_from_hosts
control = submission/sender_retain
control = dkim_disable_verify
# Accept if the message arrived over an authenticated connection, from
# any host. Again, these messages are usually from MUAs, so recipient
# verification is omitted, and submission mode is set. And again, we do this
# check before any black list tests.
accept
authenticated = *
control = submission/sender_retain
control = dkim_disable_verify
# Insist that a HELO/EHLO was accepted.
require message = nice hosts say HELO first
condition = ${if def:sender_helo_name}
# Insist that any other recipient address that we accept is either in one of
# our local domains, or is in a domain for which we explicitly allow
# relaying. Any other domain is rejected as being unacceptable for relaying.
require
message = relay not permitted
domains = +local_domains : +relay_to_domains
# We also require all accepted addresses to be verifiable. This check will
# do local part verification for local domains, but only check the domain
# for remote domains.
require
verify = recipient
# Verify recipients listed in local_rcpt_callout with a callout.
# This is especially handy for forwarding MX hosts (secondary MX or
# mail hubs) of domains that receive a lot of spam to non-existent
# addresses. The only way to check local parts for remote relay
# domains is to use a callout (add /callout), but please read the
# documentation about callouts before doing this.
deny
!acl = acl_local_deny_exceptions
recipients = ${if exists{CONFDIR/local_rcpt_callout}\
{CONFDIR/local_rcpt_callout}\
{}}
!verify = recipient/callout
# CONFDIR/local_sender_blacklist holds a list of envelope senders that
# should have their access denied to the local host. Incoming messages
# with one of these senders are rejected at RCPT time.
#
# The explicit white lists are honored as well as negative items in
# the black list. See exim4-config_files(5) for details.
deny
message = sender envelope address $sender_address is locally blacklisted here. If you think this is wrong, get in touch with postmaster
!acl = acl_local_deny_exceptions
senders = ${if exists{CONFDIR/local_sender_blacklist}\
{CONFDIR/local_sender_blacklist}\
{}}
# deny bad sites (IP address)
# CONFDIR/local_host_blacklist holds a list of host names, IP addresses
# and networks (CIDR notation) that should have their access denied to
# The local host. Messages coming in from a listed host will have all
# RCPT statements rejected.
#
# The explicit white lists are honored as well as negative items in
# the black list. See exim4-config_files(5) for details.
deny
message = sender IP address $sender_host_address is locally blacklisted here. If you think this is wrong, get in touch with postmaster
!acl = acl_local_deny_exceptions
hosts = ${if exists{CONFDIR/local_host_blacklist}\
{CONFDIR/local_host_blacklist}\
{}}
# Warn if the sender host does not have valid reverse DNS.
#
# If your system can do DNS lookups without delay or cost, you might want
# to enable this.
# If sender_host_address is defined, it's a remote call. If
# sender_host_name is not defined, then reverse lookup failed. Use
# this instead of !verify = reverse_host_lookup to catch deferrals
# as well as outright failures.
.ifdef CHECK_RCPT_REVERSE_DNS
warn
condition = ${if and{{def:sender_host_address}{!def:sender_host_name}}\
{yes}{no}}
add_header = X-Host-Lookup-Failed: Reverse DNS lookup failed for $sender_host_address (${if eq{$host_lookup_failed}{1}{failed}{deferred}})
.endif
# Use spfquery to perform a pair of SPF checks (for details, see
# http://www.openspf.org/)
#
# This is quite costly in terms of DNS lookups (~6 lookups per mail). Do not
# enable if that's an issue. Also note that if you enable this, you must
# install "spf-tools-perl" which provides the spfquery command.
# Missing spf-tools-perl will trigger the "Unexpected error in
# SPF check" warning.
.ifdef CHECK_RCPT_SPF
deny
message = [SPF] $sender_host_address is not allowed to send mail from \
${if def:sender_address_domain {$sender_address_domain}{$sender_helo_name}}. \
Please see \
http://www.openspf.org/Why?scope=${if def:sender_address_domain \
{mfrom}{helo}};identity=${if def:sender_address_domain \
{$sender_address}{$sender_helo_name}};ip=$sender_host_address
log_message = SPF check failed.
!acl = acl_local_deny_exceptions
condition = ${run{/usr/bin/spfquery.mail-spf-perl --ip \
${quote:$sender_host_address} --identity \
${if def:sender_address_domain \
{--scope mfrom --identity ${quote:$sender_address}}\
{--scope helo --identity ${quote:$sender_helo_name}}}}\
{no}{${if eq {$runrc}{1}{yes}{no}}}}
defer
message = Temporary DNS error while checking SPF record. Try again later.
!acl = acl_local_deny_exceptions
condition = ${if eq {$runrc}{5}{yes}{no}}
warn
condition = ${if <={$runrc}{6}{yes}{no}}
add_header = Received-SPF: ${if eq {$runrc}{0}{pass}\
{${if eq {$runrc}{2}{softfail}\
{${if eq {$runrc}{3}{neutral}\
{${if eq {$runrc}{4}{permerror}\
{${if eq {$runrc}{6}{none}{error}}}}}}}}}\
} client-ip=$sender_host_address; \
${if def:sender_address_domain \
{envelope-from=${sender_address}; }{}}\
helo=$sender_helo_name
warn
log_message = Unexpected error in SPF check.
condition = ${if >{$runrc}{6}{yes}{no}}
.endif
# Check against classic DNS "black" lists (DNSBLs) which list
# sender IP addresses
.ifdef CHECK_RCPT_IP_DNSBLS
warn
dnslists = CHECK_RCPT_IP_DNSBLS
add_header = X-Warning: $sender_host_address is listed at $dnslist_domain ($dnslist_value: $dnslist_text)
log_message = $sender_host_address is listed at $dnslist_domain ($dnslist_value: $dnslist_text)
.endif
# Check against DNSBLs which list sender domains, with an option to locally
# whitelist certain domains that might be blacklisted.
#
# Note: If you define CHECK_RCPT_DOMAIN_DNSBLS, you must append
# "/$sender_address_domain" after each domain. For example:
# CHECK_RCPT_DOMAIN_DNSBLS = rhsbl.foo.org/$sender_address_domain \
# : rhsbl.bar.org/$sender_address_domain
.ifdef CHECK_RCPT_DOMAIN_DNSBLS
warn
!senders = ${if exists{CONFDIR/local_domain_dnsbl_whitelist}\
{CONFDIR/local_domain_dnsbl_whitelist}\
{}}
dnslists = CHECK_RCPT_DOMAIN_DNSBLS
add_header = X-Warning: $sender_address_domain is listed at $dnslist_domain ($dnslist_value: $dnslist_text)
log_message = $sender_address_domain is listed at $dnslist_domain ($dnslist_value: $dnslist_text)
.endif
# This hook allows you to hook in your own ACLs without having to
# modify this file. If you do it like we suggest, you'll end up with
# a small performance penalty since there is an additional file being
# accessed. This doesn't happen if you leave the macro unset.
.ifdef CHECK_RCPT_LOCAL_ACL_FILE
.include CHECK_RCPT_LOCAL_ACL_FILE
.endif
#############################################################################
# This check is commented out because it is recognized that not every
# sysadmin will want to do it. If you enable it, the check performs
# Client SMTP Authorization (csa) checks on the sending host. These checks
# do DNS lookups for SRV records. The CSA proposal is currently (May 2005)
# an Internet draft. You can, of course, add additional conditions to this
# ACL statement to restrict the CSA checks to certain hosts only.
#
# require verify = csa
#############################################################################
# Accept if the address is in a domain for which we are an incoming relay,
# but again, only if the recipient can be verified.
accept
domains = +relay_to_domains
endpass
verify = recipient
# At this point, the address has passed all the checks that have been
# configured, so we accept it unconditionally.
accept
#####################################################
### end acl/30_exim4-config_check_rcpt
#####################################################
#####################################################
### acl/40_exim4-config_check_data
#####################################################
### acl/40_exim4-config_check_data
#################################
# This ACL is used after the contents of a message have been received. This
# is the ACL in which you can test a message's headers or body, and in
# particular, this is where you can invoke external virus or spam scanners.
acl_check_data:
# Deny if the message contains an overlong line. Per the standards
# we should never receive one such via SMTP.
#
.ifndef IGNORE_SMTP_LINE_LENGTH_LIMIT
deny message = maximum allowed line length is 998 octets, \
got $max_received_linelength
condition = ${if > {$max_received_linelength}{998}}
.endif
# Deny unless the address list headers are syntactically correct.
#
# If you enable this, you might reject legitimate mail.
.ifdef CHECK_DATA_VERIFY_HEADER_SYNTAX
deny
message = Message headers fail syntax check
!acl = acl_local_deny_exceptions
!verify = header_syntax
.endif
# require that there is a verifiable sender address in at least
# one of the "Sender:", "Reply-To:", or "From:" header lines.
.ifdef CHECK_DATA_VERIFY_HEADER_SENDER
deny
message = No verifiable sender address in message headers
!acl = acl_local_deny_exceptions
!verify = header_sender
.endif
# Deny if the message contains malware. Before enabling this check, you
# must install a virus scanner and set the av_scanner option in the
# main configuration.
#
# exim4-daemon-heavy must be used for this section to work.
#
# deny
# malware = *
# message = This message was detected as possible malware ($malware_name).
# Add headers to a message if it is judged to be spam. Before enabling this,
# you must install SpamAssassin. You also need to set the spamd_address
# option in the main configuration.
#
# exim4-daemon-heavy must be used for this section to work.
#
# Please note that this is only suiteable as an example. There are
# multiple issues with this configuration method. For example, if you go
# this way, you'll give your spamassassin daemon write access to the
# entire exim spool which might be a security issue in case of a
# spamassassin exploit.
#
# See the exim docs and the exim wiki for more suitable examples.
#
# warn
# spam = Debian-exim:true
# add_header = X-Spam_score: $spam_score\n\
# X-Spam_score_int: $spam_score_int\n\
# X-Spam_bar: $spam_bar\n\
# X-Spam_report: $spam_report
# This hook allows you to hook in your own ACLs without having to
# modify this file. If you do it like we suggest, you'll end up with
# a small performance penalty since there is an additional file being
# accessed. This doesn't happen if you leave the macro unset.
.ifdef CHECK_DATA_LOCAL_ACL_FILE
.include CHECK_DATA_LOCAL_ACL_FILE
.endif
# accept otherwise
accept
#####################################################
### end acl/40_exim4-config_check_data
#####################################################
#####################################################
### router/00_exim4-config_header
#####################################################
######################################################################
# ROUTERS CONFIGURATION #
# Specifies how addresses are handled #
######################################################################
# THE ORDER IN WHICH THE ROUTERS ARE DEFINED IS IMPORTANT! #
# An address is passed to each router in turn until it is accepted. #
######################################################################
begin routers
#####################################################
### end router/00_exim4-config_header
#####################################################
#####################################################
### router/100_exim4-config_domain_literal
#####################################################
### router/100_exim4-config_domain_literal
#################################
# This router handles e-mail addresses in "domain literal" form like
# <user@[10.11.12.13]>. The RFCs require this facility, but it is disabled
# in the default config since it is rarely used and frequently abused.
# Domain literal support also needs to be enabled in the main config,
# which is automatically done if you use the enable macro
# MAIN_ALLOW_DOMAIN_LITERALS.
.ifdef MAIN_ALLOW_DOMAIN_LITERALS
domain_literal:
debug_print = "R: domain_literal for $local_part@$domain"
driver = ipliteral
domains = ! +local_domains
transport = remote_smtp
.endif
#####################################################
### end router/100_exim4-config_domain_literal
#####################################################
#####################################################
### router/150_exim4-config_hubbed_hosts
#####################################################
# router/150_exim4-config_hubbed_hosts
#################################
# route specific domains manually.
#
# see exim4-config_files(5) and spec.txt chapter 20.3 through 20.7 for
# more detailed documentation.
hubbed_hosts:
debug_print = "R: hubbed_hosts for $domain"
driver = manualroute
domains = "${if exists{CONFDIR/hubbed_hosts}\
{partial-lsearch;CONFDIR/hubbed_hosts}\
fail}"
same_domain_copy_routing = yes
route_data = ${lookup{$domain}partial-lsearch{CONFDIR/hubbed_hosts}}
transport = remote_smtp
#####################################################
### end router/150_exim4-config_hubbed_hosts
#####################################################
#####################################################
### router/200_exim4-config_primary
#####################################################
### router/200_exim4-config_primary
#################################
# This file holds the primary router, responsible for nonlocal mails
.ifdef DCconfig_internet
# configtype=internet
#
# deliver mail to the recipient if recipient domain is a domain we
# relay for. We do not ignore any target hosts here since delivering to
# a site local or even a link local address might be wanted here, and if
# such an address has found its way into the MX record of such a domain,
# the local admin is probably in a place where that broken MX record
# could be fixed.
dnslookup_relay_to_domains:
debug_print = "R: dnslookup_relay_to_domains for $local_part@$domain"
driver = dnslookup
domains = ! +local_domains : +relay_to_domains
transport = remote_smtp
same_domain_copy_routing = yes
no_more
# deliver mail directly to the recipient. This router is only reached
# for domains that we do not relay for. Since we most probably can't
# have broken MX records pointing to site local or link local IP
# addresses fixed, we ignore target hosts pointing to these addresses.
dnslookup:
debug_print = "R: dnslookup for $local_part@$domain"
driver = dnslookup
domains = ! +local_domains
transport = remote_smtp
same_domain_copy_routing = yes
# ignore private rfc1918 and APIPA addresses
ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8 : 192.168.0.0/16 :\
172.16.0.0/12 : 10.0.0.0/8 : 169.254.0.0/16 :\
255.255.255.255
no_more
.endif
.ifdef DCconfig_local
# configtype=local
#
# Stand-alone system, so generate an error for mail to a non-local domain
nonlocal:
debug_print = "R: nonlocal for $local_part@$domain"
driver = redirect
domains = ! +local_domains
allow_fail
data = :fail: Mailing to remote domains not supported
no_more
.endif
.ifdef DCconfig_smarthost DCconfig_satellite
# configtype=smarthost or configtype=satellite
#
# Send all non-local mail to a single other machine (smarthost).
#
# This means _ALL_ non-local mail goes to the smarthost. This will most
# probably not do what you want for domains that are listed in
# relay_domains. The most typical use for relay_domains is to control
# relaying for incoming e-mail on secondary MX hosts. In that case,
# it doesn't make sense to send the mail to the smarthost since the
# smarthost will probably send the message right back here, causing a
# loop.
#
# If you want to use a smarthost while being secondary MX for some
# domains, you'll need to copy the dnslookup_relay_to_domains router
# here so that mail to relay_domains is handled separately.
smarthost:
debug_print = "R: smarthost for $local_part@$domain"
driver = manualroute
domains = ! +local_domains
transport = remote_smtp_smarthost
route_list = * DCsmarthost byname
host_find_failed = ignore
same_domain_copy_routing = yes
no_more
.endif
# The "no_more" above means that all later routers are for
# domains in the local_domains list, i.e. just like Exim 3 directors.
#####################################################
### end router/200_exim4-config_primary
#####################################################
#####################################################
### router/300_exim4-config_real_local
#####################################################
### router/300_exim4-config_real_local
#################################
# This router allows reaching a local user while avoiding local
# processing. This can be used to inform a user of a broken .forward
# file, for example. The userforward router does this.
COND_LOCAL_SUBMITTER = "\
${if match_ip{$sender_host_address}{:@[]}\
{1}{0}\
}"
real_local:
debug_print = "R: real_local for $local_part@$domain"
driver = accept
domains = +local_domains
condition = COND_LOCAL_SUBMITTER
local_part_prefix = real-
check_local_user
transport = LOCAL_DELIVERY
#####################################################
### end router/300_exim4-config_real_local
#####################################################
#####################################################
### router/400_exim4-config_system_aliases
#####################################################
### router/400_exim4-config_system_aliases
#################################
# This router handles aliasing using a traditional /etc/aliases file.
#
##### NB You must ensure that /etc/aliases exists. It used to be the case
##### NB that every Unix had that file, because it was the Sendmail default.
##### NB These days, there are systems that don't have it. Your aliases
##### NB file should at least contain an alias for "postmaster".
#
# This router handles the local part in a case-insensitive way which
# satisfies the RFCs requirement that postmaster be reachable regardless
# of case. If you decide to handle /etc/aliases in a caseful way, you
# need to make arrangements for a caseless postmaster.
#
# Delivery to arbitrary directories, files, and piping to programs in
# /etc/aliases is disabled per default.
# If that is a problem for you, see
# /usr/share/doc/exim4-base/README.Debian.gz
# for explanation and some workarounds.
system_aliases:
debug_print = "R: system_aliases for $local_part@$domain"
driver = redirect
domains = +local_domains
allow_fail
allow_defer
data = ${lookup{$local_part}lsearch{/etc/aliases}}
.ifdef SYSTEM_ALIASES_USER
user = SYSTEM_ALIASES_USER
.endif
.ifdef SYSTEM_ALIASES_GROUP
group = SYSTEM_ALIASES_GROUP
.endif
.ifdef SYSTEM_ALIASES_FILE_TRANSPORT
file_transport = SYSTEM_ALIASES_FILE_TRANSPORT
.endif
.ifdef SYSTEM_ALIASES_PIPE_TRANSPORT
pipe_transport = SYSTEM_ALIASES_PIPE_TRANSPORT
.endif
.ifdef SYSTEM_ALIASES_DIRECTORY_TRANSPORT
directory_transport = SYSTEM_ALIASES_DIRECTORY_TRANSPORT
.endif
#####################################################
### end router/400_exim4-config_system_aliases
#####################################################
#####################################################
### router/500_exim4-config_hubuser
#####################################################
### router/500_exim4-config_hubuser
#################################
.ifdef DCconfig_satellite
# This router is only used for configtype=satellite.
# It takes care to route all mail targeted to <somelocaluser@this.machine>
# to the host where we read our mail
#
hub_user:
debug_print = "R: hub_user for $local_part@$domain"
driver = redirect
domains = +local_domains
data = ${local_part}@DCreadhost
check_local_user
# Grab the redirected mail and deliver it.
# This is a duplicate of the smarthost router, needed because
# DCreadhost might end up as part of +local_domains
hub_user_smarthost:
debug_print = "R: hub_user_smarthost for $local_part@$domain"
driver = manualroute
domains = DCreadhost
transport = remote_smtp_smarthost
route_list = * DCsmarthost byname
host_find_failed = ignore
same_domain_copy_routing = yes
check_local_user
.endif
#####################################################
### end router/500_exim4-config_hubuser
#####################################################
#####################################################
### router/600_exim4-config_userforward
#####################################################
### router/600_exim4-config_userforward
#################################
# This router handles forwarding using traditional .forward files in users'
# home directories. It also allows mail filtering with a forward file
# starting with the string "# Exim filter" or "# Sieve filter".
#
# The no_verify setting means that this router is skipped when Exim is
# verifying addresses. Similarly, no_expn means that this router is skipped if
# Exim is processing an EXPN command.
#
# The check_ancestor option means that if the forward file generates an
# address that is an ancestor of the current one, the current one gets
# passed on instead. This covers the case where A is aliased to B and B
# has a .forward file pointing to A.
#
# The four transports specified at the end are those that are used when
# forwarding generates a direct delivery to a directory, or a file, or to a
# pipe, or sets up an auto-reply, respectively.
#
userforward:
debug_print = "R: userforward for $local_part@$domain"
driver = redirect
domains = +local_domains
check_local_user
file = $home/.forward
require_files = $local_part:$home/.forward
no_verify
no_expn
check_ancestor
allow_filter
forbid_smtp_code = true
directory_transport = address_directory
file_transport = address_file
pipe_transport = address_pipe
reply_transport = address_reply
skip_syntax_errors
syntax_errors_to = real-$local_part@$domain
syntax_errors_text = \
This is an automatically generated message. An error has\n\
been found in your .forward file. Details of the error are\n\
reported below. While this error persists, you will receive\n\
a copy of this message for every message that is addressed\n\
to you. If your .forward file is a filter file, or if it is\n\
a non-filter file containing no valid forwarding addresses,\n\
a copy of each incoming message will be put in your normal\n\
mailbox. If a non-filter file contains at least one valid\n\
forwarding address, forwarding to the valid addresses will\n\
happen, and those will be the only deliveries that occur.
#####################################################
### end router/600_exim4-config_userforward
#####################################################
#####################################################
### router/700_exim4-config_procmail
#####################################################
procmail:
debug_print = "R: procmail for $local_part@$domain"
driver = accept
domains = +local_domains
check_local_user
transport = procmail_pipe
# emulate OR with "if exists"-expansion
require_files = ${local_part}:\
${if exists{/etc/procmailrc}\
{/etc/procmailrc}{${home}/.procmailrc}}:\
+/usr/bin/procmail
no_verify
no_expn
#####################################################
### end router/700_exim4-config_procmail
#####################################################
#####################################################
### router/800_exim4-config_maildrop
#####################################################
### router/800_exim4-config_maildrop
#################################
maildrop:
debug_print = "R: maildrop for $local_part@$domain"
driver = accept
domains = +local_domains
check_local_user
transport = maildrop_pipe
require_files = ${local_part}:${home}/.mailfilter:+/usr/bin/maildrop
no_verify
no_expn
#####################################################
### end router/800_exim4-config_maildrop
#####################################################
#####################################################
### router/850_exim4-config_lowuid
#####################################################
### router/850_exim4-config_lowuid
#################################
.ifndef FIRST_USER_ACCOUNT_UID
FIRST_USER_ACCOUNT_UID = 0
.endif
.ifndef DEFAULT_SYSTEM_ACCOUNT_ALIAS
DEFAULT_SYSTEM_ACCOUNT_ALIAS = :fail: no mail to system accounts
.endif
COND_SYSTEM_USER_AND_REMOTE_SUBMITTER = "\
${if and{{! match_ip{$sender_host_address}{:@[]}}\
{<{$local_user_uid}{FIRST_USER_ACCOUNT_UID}}}\
{1}{0}\
}"
lowuid_aliases:
debug_print = "R: lowuid_aliases for $local_part@$domain (UID $local_user_uid)"
check_local_user
driver = redirect
allow_fail
domains = +local_domains
condition = COND_SYSTEM_USER_AND_REMOTE_SUBMITTER
data = ${if exists{CONFDIR/lowuid-aliases}\
{${lookup{$local_part}lsearch{CONFDIR/lowuid-aliases}\
{$value}{DEFAULT_SYSTEM_ACCOUNT_ALIAS}}}\
{DEFAULT_SYSTEM_ACCOUNT_ALIAS}}
#####################################################
### end router/850_exim4-config_lowuid
#####################################################
#####################################################
### router/900_exim4-config_local_user
#####################################################
### router/900_exim4-config_local_user
#################################
# This router matches local user mailboxes. If the router fails, the error
# message is "Unknown user".
local_user:
debug_print = "R: local_user for $local_part@$domain"
driver = accept
domains = +local_domains
check_local_user
local_parts = ! root
transport = LOCAL_DELIVERY
cannot_route_message = Unknown user
#####################################################
### end router/900_exim4-config_local_user
#####################################################
#####################################################
### router/mmm_mail4root
#####################################################
### router/mmm_mail4root
#################################
# deliver mail addressed to root to /var/mail/mail as user mail:mail
# if it was not redirected in /etc/aliases or by other means
# Exim cannot deliver as root since 4.24 (FIXED_NEVER_USERS)
mail4root:
debug_print = "R: mail4root for $local_part@$domain"
driver = redirect
domains = +local_domains
data = /var/mail/mail
file_transport = address_file
local_parts = root
user = mail
group = mail
#####################################################
### end router/mmm_mail4root
#####################################################
#####################################################
### transport/00_exim4-config_header
#####################################################
######################################################################
# TRANSPORTS CONFIGURATION #
######################################################################
# ORDER DOES NOT MATTER #
# Only one appropriate transport is called for each delivery. #
######################################################################
# A transport is used only when referenced from a router that successfully
# handles an address.
begin transports
#####################################################
### end transport/00_exim4-config_header
#####################################################
#####################################################
### transport/10_exim4-config_transport-macros
#####################################################
### transport/10_exim4-config_transport-macros
#################################
.ifdef HIDE_MAILNAME
REMOTE_SMTP_HEADERS_REWRITE=*@+local_domains $1@DCreadhost frs : *@ETC_MAILNAME $1@DCreadhost frs
REMOTE_SMTP_RETURN_PATH=${if match_domain{$sender_address_domain}{+local_domains}{${sender_address_local_part}@DCreadhost}{${if match_domain{$sender_address_domain}{ETC_MAILNAME}{${sender_address_local_part}@DCreadhost}fail}}}
.endif
.ifdef REMOTE_SMTP_HELO_FROM_DNS
.ifdef REMOTE_SMTP_HELO_DATA
REMOTE_SMTP_HELO_DATA==${lookup dnsdb {ptr=$sending_ip_address}{$value}{$primary_hostname}}
.else
REMOTE_SMTP_HELO_DATA=${lookup dnsdb {ptr=$sending_ip_address}{$value}{$primary_hostname}}
.endif
.endif
#####################################################
### end transport/10_exim4-config_transport-macros
#####################################################
#####################################################
### transport/30_exim4-config_address_file
#####################################################
# This transport is used for handling deliveries directly to files that are
# generated by aliasing or forwarding.
#
address_file:
debug_print = "T: address_file for $local_part@$domain"
driver = appendfile
delivery_date_add
envelope_to_add
return_path_add
#####################################################
### end transport/30_exim4-config_address_file
#####################################################
#####################################################
### transport/30_exim4-config_address_pipe
#####################################################
# This transport is used for handling pipe deliveries generated by
# .forward files. If the commands fails and produces any output on standard
# output or standard error streams, the output is returned to the sender
# of the message as a delivery error.
address_pipe:
debug_print = "T: address_pipe for $local_part@$domain"
driver = pipe
return_fail_output
#####################################################
### end transport/30_exim4-config_address_pipe
#####################################################
#####################################################
### transport/30_exim4-config_address_reply
#####################################################
# This transport is used for handling autoreplies generated by the filtering
# option of the userforward router.
#
address_reply:
debug_print = "T: autoreply for $local_part@$domain"
driver = autoreply
#####################################################
### end transport/30_exim4-config_address_reply
#####################################################
#####################################################
### transport/30_exim4-config_mail_spool
#####################################################
### transport/30_exim4-config_mail_spool
# This transport is used for local delivery to user mailboxes in traditional
# BSD mailbox format.
#
mail_spool:
debug_print = "T: appendfile for $local_part@$domain"
driver = appendfile
file = /var/mail/$local_part
delivery_date_add
envelope_to_add
return_path_add
group = mail
mode = 0660
mode_fail_narrower = false
#####################################################
### end transport/30_exim4-config_mail_spool
#####################################################
#####################################################
### transport/30_exim4-config_maildir_home
#####################################################
### transport/30_exim4-config_maildir_home
#################################
# Use this instead of mail_spool if you want to to deliver to Maildir in
# home-directory - change the definition of LOCAL_DELIVERY
#
maildir_home:
debug_print = "T: maildir_home for $local_part@$domain"
driver = appendfile
.ifdef MAILDIR_HOME_MAILDIR_LOCATION
directory = MAILDIR_HOME_MAILDIR_LOCATION
.else
directory = $home/Maildir
.endif
.ifdef MAILDIR_HOME_CREATE_DIRECTORY
create_directory
.endif
.ifdef MAILDIR_HOME_CREATE_FILE
create_file = MAILDIR_HOME_CREATE_FILE
.endif
delivery_date_add
envelope_to_add
return_path_add
maildir_format
.ifdef MAILDIR_HOME_DIRECTORY_MODE
directory_mode = MAILDIR_HOME_DIRECTORY_MODE
.else
directory_mode = 0700
.endif
.ifdef MAILDIR_HOME_MODE
mode = MAILDIR_HOME_MODE
.else
mode = 0600
.endif
mode_fail_narrower = false
# This transport always chdirs to $home before trying to deliver. If
# $home is not accessible, this chdir fails and prevents delivery.
# If you are in a setup where home directories might not be
# accessible, uncomment the current_directory line below.
# current_directory = /
#####################################################
### end transport/30_exim4-config_maildir_home
#####################################################
#####################################################
### transport/30_exim4-config_maildrop_pipe
#####################################################
maildrop_pipe:
debug_print = "T: maildrop_pipe for $local_part@$domain"
driver = pipe
path = "/bin:/usr/bin:/usr/local/bin"
command = "/usr/bin/maildrop"
message_prefix =
message_suffix =
return_path_add
delivery_date_add
envelope_to_add
#####################################################
### end transport/30_exim4-config_maildrop_pipe
#####################################################
#####################################################
### transport/30_exim4-config_procmail_pipe
#####################################################
procmail_pipe:
debug_print = "T: procmail_pipe for $local_part@$domain"
driver = pipe
path = "/bin:/usr/bin:/usr/local/bin"
command = "/usr/bin/procmail"
return_path_add
delivery_date_add
envelope_to_add
#####################################################
### end transport/30_exim4-config_procmail_pipe
#####################################################
#####################################################
### transport/30_exim4-config_remote_smtp
#####################################################
### transport/30_exim4-config_remote_smtp
#################################
# This transport is used for delivering messages over SMTP connections.
# Refuse to send any message with over-long lines, which could have
# been received other than via SMTP. The use of message_size_limit to
# enforce this is a red herring.
remote_smtp:
debug_print = "T: remote_smtp for $local_part@$domain"
driver = smtp
.ifndef IGNORE_SMTP_LINE_LENGTH_LIMIT
message_size_limit = ${if > {$max_received_linelength}{998} {1}{0}}
.endif
.ifdef REMOTE_SMTP_HOSTS_AVOID_TLS
hosts_avoid_tls = REMOTE_SMTP_HOSTS_AVOID_TLS
.endif
.ifdef REMOTE_SMTP_HEADERS_REWRITE
headers_rewrite = REMOTE_SMTP_HEADERS_REWRITE
.endif
.ifdef REMOTE_SMTP_RETURN_PATH
return_path = REMOTE_SMTP_RETURN_PATH
.endif
.ifdef REMOTE_SMTP_HELO_DATA
helo_data=REMOTE_SMTP_HELO_DATA
.endif
.ifdef DKIM_DOMAIN
dkim_domain = DKIM_DOMAIN
.endif
.ifdef DKIM_SELECTOR
dkim_selector = DKIM_SELECTOR
.endif
.ifdef DKIM_PRIVATE_KEY
dkim_private_key = DKIM_PRIVATE_KEY
.endif
.ifdef DKIM_CANON
dkim_canon = DKIM_CANON
.endif
.ifdef DKIM_STRICT
dkim_strict = DKIM_STRICT
.endif
.ifdef DKIM_SIGN_HEADERS
dkim_sign_headers = DKIM_SIGN_HEADERS
.endif
.ifdef TLS_DH_MIN_BITS
tls_dh_min_bits = TLS_DH_MIN_BITS
.endif
.ifdef REMOTE_SMTP_TLS_CERTIFICATE
tls_certificate = REMOTE_SMTP_TLS_CERTIFICATE
.endif
.ifdef REMOTE_SMTP_PRIVATEKEY
tls_privatekey = REMOTE_SMTP_PRIVATEKEY
.endif
#####################################################
### end transport/30_exim4-config_remote_smtp
#####################################################
#####################################################
### transport/30_exim4-config_remote_smtp_smarthost
#####################################################
### transport/30_exim4-config_remote_smtp_smarthost
#################################
# This transport is used for delivering messages over SMTP connections
# to a smarthost. The local host tries to authenticate.
# This transport is used for smarthost and satellite configurations.
# Refuse to send any messsage with over-long lines, which could have
# been received other than via SMTP. The use of message_size_limit to
# enforce this is a red herring.
remote_smtp_smarthost:
debug_print = "T: remote_smtp_smarthost for $local_part@$domain"
driver = smtp
.ifndef IGNORE_SMTP_LINE_LENGTH_LIMIT
message_size_limit = ${if > {$max_received_linelength}{998} {1}{0}}
.endif
hosts_try_auth = <; ${if exists{CONFDIR/passwd.client} \
{\
${lookup{$host}nwildlsearch{CONFDIR/passwd.client}{$host_address}}\
}\
{} \
}
.ifdef REMOTE_SMTP_SMARTHOST_HOSTS_AVOID_TLS
hosts_avoid_tls = REMOTE_SMTP_SMARTHOST_HOSTS_AVOID_TLS
.endif
.ifdef REMOTE_SMTP_SMARTHOST_HOSTS_REQUIRE_TLS
hosts_require_tls = REMOTE_SMTP_SMARTHOST_HOSTS_REQUIRE_TLS
.endif
.ifdef REMOTE_SMTP_HEADERS_REWRITE
headers_rewrite = REMOTE_SMTP_HEADERS_REWRITE
.endif
.ifdef REMOTE_SMTP_RETURN_PATH
return_path = REMOTE_SMTP_RETURN_PATH
.endif
.ifdef REMOTE_SMTP_HELO_DATA
helo_data=REMOTE_SMTP_HELO_DATA
.endif
.ifdef TLS_DH_MIN_BITS
tls_dh_min_bits = TLS_DH_MIN_BITS
.endif
.ifdef REMOTE_SMTP_SMARTHOST_TLS_CERTIFICATE
tls_certificate = REMOTE_SMTP_SMARTHOST_TLS_CERTIFICATE
.endif
.ifdef REMOTE_SMTP_SMARTHOST_PRIVATEKEY
tls_privatekey = REMOTE_SMTP_SMARTHOST_PRIVATEKEY
.endif
#####################################################
### end transport/30_exim4-config_remote_smtp_smarthost
#####################################################
#####################################################
### transport/35_exim4-config_address_directory
#####################################################
# This transport is used for handling file addresses generated by alias
# or .forward files if the path ends in "/", which causes it to be treated
# as a directory name rather than a file name.
address_directory:
debug_print = "T: address_directory for $local_part@$domain"
driver = appendfile
delivery_date_add
envelope_to_add
return_path_add
check_string = ""
escape_string = ""
maildir_format
#####################################################
### end transport/35_exim4-config_address_directory
#####################################################
#####################################################
### retry/00_exim4-config_header
#####################################################
######################################################################
# RETRY CONFIGURATION #
######################################################################
begin retry
#####################################################
### end retry/00_exim4-config_header
#####################################################
#####################################################
### retry/30_exim4-config
#####################################################
### retry/30_exim4-config
#################################
# This single retry rule applies to all domains and all errors. It specifies
# retries every 15 minutes for 2 hours, then increasing retry intervals,
# starting at 1 hour and increasing each time by a factor of 1.5, up to 16
# hours, then retries every 6 hours until 4 days have passed since the first
# failed delivery.
# Please note that these rules only limit the frequency of retries, the
# effective retry-time depends on the frequency of queue-running, too.
# See QUEUEINTERVAL in /etc/default/exim4.
# Address or Domain Error Retries
# ----------------- ----- -------
* * F,2h,15m; G,16h,1h,1.5; F,4d,6h
#####################################################
### end retry/30_exim4-config
#####################################################
#####################################################
### rewrite/00_exim4-config_header
#####################################################
######################################################################
# REWRITE CONFIGURATION #
######################################################################
begin rewrite
#####################################################
### end rewrite/00_exim4-config_header
#####################################################
#####################################################
### rewrite/31_exim4-config_rewriting
#####################################################
### rewrite/31_exim4-config_rewriting
#################################
# This rewriting rule is particularly useful for dialup users who
# don't have their own domain, but could be useful for anyone.
# It looks up the real address of all local users in a file
.ifndef NO_EAA_REWRITE_REWRITE
*@+local_domains "${lookup{${local_part}}lsearch{/etc/email-addresses}\
{$value}fail}" Ffrs
# identical rewriting rule for /etc/mailname
*@ETC_MAILNAME "${lookup{${local_part}}lsearch{/etc/email-addresses}\
{$value}fail}" Ffrs
.endif
#####################################################
### end rewrite/31_exim4-config_rewriting
#####################################################
#####################################################
### auth/00_exim4-config_header
#####################################################
######################################################################
# AUTHENTICATION CONFIGURATION #
######################################################################
begin authenticators
#####################################################
### end auth/00_exim4-config_header
#####################################################
#####################################################
### auth/30_exim4-config_examples
#####################################################
### auth/30_exim4-config_examples
#################################
# The examples below are for server side authentication, when the
# local exim is SMTP server and clients authenticate to the local exim.
# They allow two styles of plain-text authentication against an
# CONFDIR/passwd file whose syntax is described in exim4_passwd(5).
# Hosts that are allowed to use AUTH are defined by the
# auth_advertise_hosts option in the main configuration. The default is
# "*", which allows authentication to all hosts over all kinds of
# connections if there is at least one authenticator defined here.
# Authenticators which rely on unencrypted clear text passwords don't
# advertise on unencrypted connections by default. Thus, it might be
# wise to set up TLS to allow encrypted connections. If TLS cannot be
# used for some reason, you can set AUTH_SERVER_ALLOW_NOTLS_PASSWORDS to
# advertise unencrypted clear text password based authenticators on all
# connections. As this is severely reducing security, using TLS is
# preferred over allowing clear text password based authenticators on
# unencrypted connections.
# PLAIN authentication has no server prompts. The client sends its
# credentials in one lump, containing an authorization ID (which we do not
# use), an authentication ID, and a password. The latter two appear as
# $auth2 and $auth3 in the configuration and should be checked against a
# valid username and password. In a real configuration you would typically
# use $auth2 as a lookup key, and compare $auth3 against the result of the
# lookup, perhaps using the crypteq{}{} condition.
# plain_server:
# driver = plaintext
# public_name = PLAIN
# server_condition = "${if crypteq{$auth3}{${extract{1}{:}{${lookup{$auth2}lsearch{CONFDIR/passwd}{$value}{*:*}}}}}{1}{0}}"
# server_set_id = $auth2
# server_prompts = :
# .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS
# server_advertise_condition = ${if eq{$tls_in_cipher}{}{}{*}}
# .endif
# LOGIN authentication has traditional prompts and responses. There is no
# authorization ID in this mechanism, so unlike PLAIN the username and
# password are $auth1 and $auth2. Apart from that you can use the same
# server_condition setting for both authenticators.
# login_server:
# driver = plaintext
# public_name = LOGIN
# server_prompts = "Username:: : Password::"
# server_condition = "${if crypteq{$auth2}{${extract{1}{:}{${lookup{$auth1}lsearch{CONFDIR/passwd}{$value}{*:*}}}}}{1}{0}}"
# server_set_id = $auth1
# .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS
# server_advertise_condition = ${if eq{$tls_in_cipher}{}{}{*}}
# .endif
#
# cram_md5_server:
# driver = cram_md5
# public_name = CRAM-MD5
# server_secret = ${extract{2}{:}{${lookup{$auth1}lsearch{CONFDIR/passwd}{$value}fail}}}
# server_set_id = $auth1
# Here is an example of CRAM-MD5 authentication against PostgreSQL:
#
# psqldb_auth_server:
# driver = cram_md5
# public_name = CRAM-MD5
# server_secret = ${lookup pgsql{SELECT pw FROM users WHERE username = '${quote_pgsql:$auth1}'}{$value}fail}
# server_set_id = $auth1
# Authenticate against local passwords using sasl2-bin
# Requires exim_uid to be a member of sasl group, see README.Debian.gz
# plain_saslauthd_server:
# driver = plaintext
# public_name = PLAIN
# server_condition = ${if saslauthd{{$auth2}{$auth3}}{1}{0}}
# server_set_id = $auth2
# server_prompts = :
# .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS
# server_advertise_condition = ${if eq{$tls_in_cipher}{}{}{*}}
# .endif
#
# login_saslauthd_server:
# driver = plaintext
# public_name = LOGIN
# server_prompts = "Username:: : Password::"
# # don't send system passwords over unencrypted connections
# server_condition = ${if saslauthd{{$auth1}{$auth2}}{1}{0}}
# server_set_id = $auth1
# .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS
# server_advertise_condition = ${if eq{$tls_in_cipher}{}{}{*}}
# .endif
#
# ntlm_sasl_server:
# driver = cyrus_sasl
# public_name = NTLM
# server_realm = <short main hostname>
# server_set_id = $auth1
# .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS
# server_advertise_condition = ${if eq{$tls_in_cipher}{}{}{*}}
# .endif
#
# digest_md5_sasl_server:
# driver = cyrus_sasl
# public_name = DIGEST-MD5
# server_realm = <short main hostname>
# server_set_id = $auth1
# .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS
# server_advertise_condition = ${if eq{$tls_in_cipher}{}{}{*}}
# .endif
# Authentcate against cyrus-sasl
# This is mainly untested, please report any problems to
# pkg-exim4-users@lists.alioth.debian.org.
# cram_md5_sasl_server:
# driver = cyrus_sasl
# public_name = CRAM-MD5
# server_realm = <short main hostname>
# server_set_id = $auth1
#
# plain_sasl_server:
# driver = cyrus_sasl
# public_name = PLAIN
# server_realm = <short main hostname>
# server_set_id = $auth1
# .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS
# server_advertise_condition = ${if eq{$tls_in_cipher}{}{}{*}}
# .endif
#
# login_sasl_server:
# driver = cyrus_sasl
# public_name = LOGIN
# server_realm = <short main hostname>
# server_set_id = $auth1
# .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS
# server_advertise_condition = ${if eq{$tls_in_cipher}{}{}{*}}
# .endif
# Authenticate against courier authdaemon
# This is now the (working!) example from
# http://www.exim.org/eximwiki/FAQ/Policy_controls/Q0730
# Possible pitfall: access rights on /var/run/courier/authdaemon/socket.
# plain_courier_authdaemon:
# driver = plaintext
# public_name = PLAIN
# server_condition = \
# ${extract {ADDRESS} \
# {${readsocket{/var/run/courier/authdaemon/socket} \
# {AUTH ${strlen:exim\nlogin\n$auth2\n$auth3\n}\nexim\nlogin\n$auth2\n$auth3\n} }} \
# {yes} \
# fail}
# server_set_id = $auth2
# .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS
# server_advertise_condition = ${if eq{$tls_in_cipher}{}{}{*}}
# .endif
# login_courier_authdaemon:
# driver = plaintext
# public_name = LOGIN
# server_prompts = Username:: : Password::
# server_condition = \
# ${extract {ADDRESS} \
# {${readsocket{/var/run/courier/authdaemon/socket} \
# {AUTH ${strlen:exim\nlogin\n$auth1\n$auth2\n}\nexim\nlogin\n$auth1\n$auth2\n} }} \
# {yes} \
# fail}
# server_set_id = $auth1
# .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS
# server_advertise_condition = ${if eq{$tls_in_cipher}{}{}{*}}
# .endif
# This one is a bad hack to support the broken version 4.xx of
# Microsoft Outlook Express which violates the RFCs by demanding
# "250-AUTH=" instead of "250-AUTH ".
# If your list of offered authenticators is other than PLAIN and LOGIN,
# you need to adapt the public_name line manually.
# It has to be the last authenticator to work and has not been tested
# well. Use at your own risk.
# See the thread entry point from
# http://www.exim.org/mail-archives/exim-users/Week-of-Mon-20050214/msg00213.html
# for the related discussion on the exim-users mailing list.
# Thanks to Fred Viles for this great work.
# support_broken_outlook_express_4_server:
# driver = plaintext
# public_name = "\r\n250-AUTH=PLAIN LOGIN"
# server_prompts = User Name : Password
# server_condition = no
# .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS
# server_advertise_condition = ${if eq{$tls_in_cipher}{}{}{*}}
# .endif
##############
# See /usr/share/doc/exim4-base/README.Debian.gz
##############
# These examples below are the equivalent for client side authentication.
# They get the passwords from CONFDIR/passwd.client, whose format is
# defined in exim4_passwd_client(5)
# Because AUTH PLAIN and AUTH LOGIN send the password in clear, we
# only allow these mechanisms over encrypted connections by default.
# You can set AUTH_CLIENT_ALLOW_NOTLS_PASSWORDS to allow unencrypted
# clear text password authentication on all connections.
cram_md5:
driver = cram_md5
public_name = CRAM-MD5
client_name = ${extract{1}{:}{${lookup{$host}nwildlsearch{CONFDIR/passwd.client}{$value}fail}}}
client_secret = ${extract{2}{:}{${lookup{$host}nwildlsearch{CONFDIR/passwd.client}{$value}fail}}}
# this returns the matching line from passwd.client and doubles all ^
PASSWDLINE=${sg{\
${lookup{$host}nwildlsearch{CONFDIR/passwd.client}{$value}fail}\
}\
{\\N[\\^]\\N}\
{^^}\
}
plain:
driver = plaintext
public_name = PLAIN
.ifndef AUTH_CLIENT_ALLOW_NOTLS_PASSWORDS
client_send = "<; ${if !eq{$tls_out_cipher}{}\
{^${extract{1}{:}{PASSWDLINE}}\
^${sg{PASSWDLINE}{\\N([^:]+:)(.*)\\N}{\\$2}}\
}fail}"
.else
client_send = "<; ^${extract{1}{:}{PASSWDLINE}}\
^${sg{PASSWDLINE}{\\N([^:]+:)(.*)\\N}{\\$2}}"
.endif
login:
driver = plaintext
public_name = LOGIN
.ifndef AUTH_CLIENT_ALLOW_NOTLS_PASSWORDS
# Return empty string if not non-TLS AND looking up $host in passwd-file
# yields a non-empty string; fail otherwise.
client_send = "<; ${if and{\
{!eq{$tls_out_cipher}{}}\
{!eq{PASSWDLINE}{}}\
}\
{}fail}\
; ${extract{1}{::}{PASSWDLINE}}\
; ${sg{PASSWDLINE}{\\N([^:]+:)(.*)\\N}{\\$2}}"
.else
# Return empty string if looking up $host in passwd-file yields a
# non-empty string; fail otherwise.
client_send = "<; ${if !eq{PASSWDLINE}{}\
{}fail}\
; ${extract{1}{::}{PASSWDLINE}}\
; ${sg{PASSWDLINE}{\\N([^:]+:)(.*)\\N}{\\$2}}"
.endif
#####################################################
### end auth/30_exim4-config_examples
#####################################################
|