Functions That Distinguish sendmail.cf From submit.cf

The sendmail.cf configuration file is for the daemon mode. When using this file, sendmail is acting as a mail transfer agent (MTA), which is started by root.

/usr/lib/sendmail -L sm-mta -bd -q1h

See the following list of other distinguishing functions for sendmail.cf:

• By default, sendmail.cf accepts SMTP connections on ports 25 and 587.

• By default, sendmail.cf runs the main queue, /var/spool/mqueue.