How To Setup A Smart Relay Host Port on Sendmail

Author: erics, Posted January 26th, 2011 at 3:43:41am

Configure the Smart Host

Search for DS in /etc/mail/sendmail.cf and edit as follows:
Before:
DS

After:
DSyour.mail.relay.yourdomain.com

Configure The Port

Search for Mrelay and edit as follows:

Before:

Mrelay, P=[IPC], F=mDFMuXa8, S=EnvFromSMTP/HdrFromSMTP, R=MasqSMTP, E=\r\n, L=2040,
T=DNS/RFC822/SMTP,
A=TCP $h

After:

Mrelay, P=[IPC], F=mDFMuXa8, S=EnvFromSMTP/HdrFromSMTP, R=MasqSMTP, E=\r\n, L=2040,
T=DNS/RFC822/SMTP,
A=TCP $h 2525

Add the following line appropriately modified to /etc/mail/access file:

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

Restart Sendmail:

service sendmail restart

Keep Watch

tail -f /var/log/maillog

Categories: How-To's, Technology Tags: DS, Email, Email Relay, howto, Port, Relay, SendMail, Smart Host, SmartHost, tips