/etc/exim4/conf.d/router/400_exim4-config_system_aliases 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 | ### 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
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