/usr/share/sendmail/examples/db/sendmail.cM is in sendmail-base 8.14.4-4.1ubuntu1.
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 | # /etc/mail/sendmail.cM
# Copyright (c) 1998, Richard Nelson <cowboy@debian.org>.
# Time-stamp: <1998/10/27 10:00:00 cowboy>
# GPL'd config file, please feed any gripes, suggestions, etc. to me
#
# Function:
# Specify mail domains, which when relayed, will be rewritten
# to appear as the MASQUERADE_AS address
#
# Usage:
# MASQUERADE_DOMAIN_FILE(`[-o ]/etc/mail/sendmail.cM')dnl
#
# Format:
# fqdn
#
# Examples:
# debian.org
#
# Notes:
# Class=$M
#
# Related:
# EXPOSED_USER(root uucp)dnl <<- these are exempt from masquerading
# FEATURE(allmasquerade)dnl <<- rewrite recipient addrs too
# FEATURE(always_add_domain)dnl <<- add domain to unqualified names
# FEATURE(limited_masquerade)dnl <<- only masq domains in $=M
# FEATURE(masquerade_entire_domain)dnl <<- masq all hosts under domain
# FEATURE(masquerade_envelope)dnl <<- rewrite envelope return address too
# GENERICS_DOMAIN_FILE(`/etc/mail/sendmail.cG')dnl <<- masq From:
#
# Local names
#
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