# Copyright (c) 2007 Antoine Jacoutot <ajacoutot@lphp.org>

# This document helps you to configure sendmail(8) under OpenBSD
# so that all mail is sent to a central server.
# Using this method, no daemon needs to be started/listening.
# Beware though, using sendmail(8) as a client only automatically
# deactivate some features (such as aliases(5)...).

$ cd /usr/share/sendmail/cf/

$ sudo cp -p submic.mc `hostname`-submit.mc

$ sudoedit `hostname`-submit.mc
# change "FEATURE(`msp', `[127.0.0.1]')dnl" with
"FEATURE(`msp', `[mtahost.domain.tld]')dnl"
# alternatively, you can just replace "D{MTAHost}[127.0.0.1]"
# in the default /etc/mail/submit.cf file with
"D{MTAHost}[mtahost.domain.tld]"

$ sudo make `hostname`-submit.cf
$ sudo mv `hostname`-submit.cf /etc/mail/submit.cf

$ sudoedit /etc/rc.conf.local
# add/change the variable
"sendmail_flags=NO"

# then, to make the server mtahost.domain.tld accept the messages
# for `hostname`, you can use one of the followings

# (1)
# masquerade the sender so that the server responsable for domain.tld
# accepts the message (and be its final destination)
$ sudoedit /usr/share/sendmail/cf/`hostname`-submit.mc
# add/change the following lines
"MASQUERADE_AS(`domain.tld')dnl"
"FEATURE(`masquerade_envelope')dnl"
"FEATURE(`allmasquerade')dnl"
$ sudo make `hostname`-submit.cf
$ sudo mv `hostname`-submit.cf /etc/mail/submit.cf

# (2)
# on the server mtahost.domain.tld, we consider that any messages
# to *.domain.tld are local
$ sudoedit /etc/mail/mailertable
# add the following line
".domain.tld	local"
$ sudo makemap hash /etc/mail/mailertable < /etc/mail/mailertable

$ sudo kill `head -1 /var/run/sendmail.pid`