RHEL 5 Sendmail using to send mail to Relay MTA.

So I have been working on sendmail so that we are not running the sendmail daemon in the background on RHEL 5 and just have the server submit mail to our main SMTP server. To do this edit the following files.

/etc/sysconfig/sendmail

change the line

DAEMON=yes
to
DAEMON=no

Then edit the following file.

/etc/mail/submit.cf

change the line

D{MTAHost}[127.0.0.1]
to
D{MTAHost}[smtp.relayserver.com]

Restart the sendmail service

service sendmail restart

That's it.