/usr/share/sendmail/examples/db/relay-domains is in sendmail-base 8.15.2-3.
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 | # /etc/mail/relay-domains
# 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:
# Control what hosts are allowed to relay (or be a relay)
#
# Usage:
# define(`confCR_FILE', `[-o ]/etc/mail/relay-domains')dnl
# RELAY_DOMAIN_FILE(`/etc/mail/relay-domains %[^\#]')dnl
#
# Format:
# lhs:
#
# Notes:
# Class $=R
# These are domains unless FEATURE(relay_hosts_only) is used,
# then these names must be fully qualified host names!
#
# Related:
# FEATURE(relay_hosts_only)dnl
# FEATURE(relay_entire_domain)dnl <<- relays any host in the $=m class
# FEATURE(relay_based_on_MX)dnl <<- relaying for boxes MX'd to you
# FEATURE(access_db)dnl
# EATURE(blacklist_recipients)dnl
# FEATURE(rbl[,alternate server])dnl
# FEATURE(orbs[,alternate server])dnl <<- Debian addition
# FEATURE(accept_unqualified_senders)dnl
# FEATURE(accept_unresolvable_domains)dnl
#
# Hosts that I will relay to:
#
# Hosts that can relay to me:
#
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