Smart Relay Host Port in Sendmail

There is an alternative to relay email using a different port at their mail server and their mail server supports SMTP authentication. You may follow the simple Sendmail setup below: –

1. Find “DS” in /etc/mail/sendmail.cf and add your mail server name as below: –

DSmail.example.com

2. Find “Mrelay” in /etc/mail/sendmail.cf and add “2525” to “A=TCP $h” as below: –

A=TCP $h 2525

3. Add the following line below in /etc/mail/access file in one line: –

AuthInfo:mail.example.com "U:user@example.com" "I:user@example.com" "P:password" "R:example.com" "M:LOGIN PLAIN"

4. Then, restart your Sendmail service as below: –

service sendmail restart

5. Finally, you can monitor your maillog using the command below: –

tail -f /var/log/maillog

Reference [1] http://wingloon.com/2008/04/06/setup-smart-relay-host-port-in-sendmail/