/etc/courier/pop3d is in courier-pop 0.68.2-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# pop3d created from pop3d.dist by sysconftool
#
# Do not alter lines that begin with ##, they are used when upgrading
# this configuration.
#
# Copyright 1998 - 2011 Double Precision, Inc. See COPYING for
# distribution information.
#
# Courier POP3 daemon configuration
#
##NAME: PIDFILE:0
#
PIDFILE=/var/run/courier/pop3d.pid
##NAME: MAXDAEMONS:0
#
# Maximum number of POP3 servers started
#
MAXDAEMONS=40
##NAME: MAXPERIP:4
#
# Maximum number of connections to accept from the same IP address
MAXPERIP=4
##NAME: POP3AUTH:1
#
# To advertise the SASL capability, per RFC 2449, uncomment the POP3AUTH
# variable:
#
# POP3AUTH="LOGIN"
#
# If you have configured the CRAM-MD5, CRAM-SHA1 or CRAM-SHA256, set POP3AUTH
# to something like this:
#
# POP3AUTH="LOGIN CRAM-MD5 CRAM-SHA1"
POP3AUTH=""
##NAME: POP3AUTH_ORIG:1
#
# For use by webadmin
POP3AUTH_ORIG="PLAIN LOGIN CRAM-MD5 CRAM-SHA1 CRAM-SHA256"
##NAME: POP3AUTH_TLS:1
#
# To also advertise SASL PLAIN if SSL is enabled, uncomment the
# POP3AUTH_TLS environment variable:
#
# POP3AUTH_TLS="LOGIN PLAIN"
POP3AUTH_TLS=""
##NAME: POP3AUTH_TLS_ORIG:0
#
# For use by webadmin
POP3AUTH_TLS_ORIG="LOGIN PLAIN"
##NAME: POP3_PROXY:0
#
# Enable proxying. See README.proxy
POP3_PROXY=0
##NAME: PROXY_HOSTNAME:0
#
# Override value from gethostname() when checking if a proxy connection is
# required.
# PROXY_HOSTNAME=
##NAME: PORT:1
#
# Port to listen on for connections. The default is port 110.
#
# Multiple port numbers can be separated by commas. When multiple port
# numbers are used it is possibly to select a specific IP address for a
# given port as "ip.port". For example, "127.0.0.1.900,192.68.0.1.900"
# accepts connections on port 900 on IP addresses 127.0.0.1 and 192.68.0.1
# The ADDRESS setting is a default for ports that do not have a specified
# IP address.
PORT=110
##NAME: ADDRESS:0
#
# IP address to listen on. 0 means all IP addresses.
ADDRESS=0
##NAME: AUTHSERVICE:0
#
# It's possible to authenticate using a different 'service' parameter
# depending on the connection's port. This only works with authentication
# modules that use the 'service' parameter, such as PAM. Example:
#
# AUTHSERVICE110=pop3
# AUTHSERVICE995=pop3s
##NAME: TCPDOPTS:0
#
# Other couriertcpd(1) options. The following defaults should be fine.
#
TCPDOPTS="-nodnslookup -noidentlookup"
##NAME: LOGGEROPTS:0
#
# courierlogger(1) options.
#
LOGGEROPTS="-name=pop3d"
##NAME: DEFDOMAIN:0
#
# Optional default domain. If the username does not contain the
# first character of DEFDOMAIN, then it is appended to the username.
# If DEFDOMAIN and DOMAINSEP are both set, then DEFDOMAIN is appended
# only if the username does not contain any character from DOMAINSEP.
# You can set different default domains based on the the interface IP
# address using the -access and -accesslocal options of couriertcpd(1).
#DEFDOMAIN="@example.com"
##NAME: POP3DSTART:0
#
# POP3DSTART is not referenced anywhere in the standard Courier programs
# or scripts. Rather, this is a convenient flag to be read by your system
# startup script in /etc/rc.d, like this:
#
# . /etc/courier/pop3d
# case x$POP3DSTART in
# x[yY]*)
# /usr/lib/courier/pop3d.rc start
# ;;
# esac
#
# The default setting is going to be NO, until Courier is shipped by default
# with enough platforms so that people get annoyed with having to flip it to
# YES every time.
POP3DSTART=YES
##NAME: POP3_LOG_DELETIONS:0
#
#
# Set POP3_LOG_DELETIONS to log all message deletions to syslog.
#
# POP3_LOG_DELETIONS=1
##NAME: MAILDIRPATH:0
#
# MAILDIRPATH - directory name of the maildir directory.
#
MAILDIRPATH=Maildir
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