1. Open up your Sendmail configuration file (/etc/mail/sendmail.cf) with your favorite text editor (vi, joe, etc).
2. Look for the following lines:
# "Smart" relay host (may be null)
DS
3. Now, append the smart host to the DS field (with no spaces!) like so:
# "Smart" relay host (may be null)
DSserver100.appriver.com
4. You will then need to save the file and restart the Sendmail service.
(service sendmail restart, killall -1 sendmail, etc)
Article ID: 242, Created: 11/19/2007 at 3:48 PM, Modified: 8/12/2019 at 5:31 PM