In the standard sendmail configuration, one instance of
sendmail runs as a daemon that typically serves two purposes:
It serves as the SMTP server.
It forks a sub-daemon at specified intervals to process the mail queue.
This daemon starts when the system enters multi-user mode and stops
when the system is shut down.
The command that starts this
daemon is in the /etc/rc2.d/P86sendmail script.
The default command in this file combines the -bd flag and
the -q flag in one call to allow incoming SMTP mail and
set the queue-processing intervals to 1 hour, respectively.
You do not need to change this command
unless you know that you want to change the interval
or add other flags.