/etc/courier/esmtpd-msa is in courier-mta 0.78.0-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
#
# esmtpd-msa created from esmtpd-msa.dist by sysconftool
#
# Do not alter lines that begin with ##, they are used when upgrading
# this configuration.
#
# Copyright 2001-2004 Double Precision, Inc. See COPYING for
# distribution information.
#
# This configuration file sets various options for Courier's mail submission
# ESMTP server (RFC 2476). Basically, this is the plain old port 25
# ESMTP server, with a couple of difference.
#
# This configuration file is read after esmtpd, therefore it only needs
# to override some options that would differ from port 25. The first
# section of this configuration file sets options that are likely to be
# different than the esmtpd options.
##NAME: BOFHCHECKDNS:0
#
# ESMTP MSA is likely to want to verify return domain addresses.
BOFHCHECKDNS=1
##NAME: NOADDMSGID:0
#
# Add the Message-ID: header, if missing. The default value for esmtp
# is 1, but we want it 0 here:
NOADDMSGID=0
##NAME: NOADDDATE:0
#
# Ditto for the Date: header.
NOADDDATE=0
##NAME: NOADDRREWRITE:0
#
# Don't rewrite To:, From:, and Cc: headers. Set to 2 in order to omit
# rewriting them only if there is a DKIM-Signature.
NOADDRREWRITE=0
##NAME: ESMTP_LOG_DIALOG:0
#
# If set, log the esmtp dialog.
ESMTP_LOG_DIALOG=0
##NAME: AUTH_REQUIRED:0
#
# Set AUTH_REQUIRED to 1 in order to force the client to use ESMTP
# authentication. You can override AUTH_REQUIRED on a per-IP address basis
# using smtpaccess. See makesmtpaccess(8).
AUTH_REQUIRED=0
##NAME: BLACKLISTS: 0
#
# You probably want to turn off any blacklist checking, if you have it
# enabled in esmtpd
BLACKLISTS=""
##NAME: ADDRESS:1
#
# Address to listen on, can be set to a single IP address.
ADDRESS=0
##NAME: PORT:1
#
# PORT specified the port number to listen on. The standard msa port
# is port 587.
#
# 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, if given, is a default for ports that do not have
# a specified IP address.
PORT=587
##NAME: PIDFILE:0
#
# We *MUST* use a different PID file than esmtpd!!!
#
PIDFILE=/run/courier/esmtpd-msa.pid
##NAME: ACCESSFILE:1
#
# You can use a different access file for esmtp-msa than for esmtp.
# To do that, create it yourself, and use makesmtpaccess-msa instead of
# makesmtpaccess.
ACCESSFILE=${sysconfdir}/smtpaccess
##NAME: ESMTPDSTART:0
#
# ESMTPDSTART 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:
#
# prefix=/usr
# exec_prefix=/usr
# . ${sysconfdir}/esmtpd
# . ${sysconfdir}/esmtpd-msa
# case x$ESMTPDSTART in
# x[yY]*)
# /usr/sbin/esmtpd-msa 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.
ESMTPDSTART=NO
##NAME: SYSLOGNAME:0
#
# Name that courieresmtpd uses to log to syslog
#
# SYSLOGNAME=courieresmtpd
##NAME: CUSTOM:1
#
# Here, you can stick it any additional esmtpd settings that you want to
# override. Some of the ones you are likely to want overriden may include
# MAXDAEMONS, MAXPERC, MAXPERIP, AUTHMODULES, ESMTPAUTH, and ESMTPAUTH_TLS.
# If you want to override them, do it here:
#
##NAME: MAXDAEMONS:1
MAXDAEMONS=40
##NAME: MAXPERC:1
MAXPERC=5
##NAME: MAXPERIP:1
MAXPERIP=5
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