This section describes some helpful tasks for queue administration. For information about the client-only queue, see submit.cf Configuration File in Version 8.12 of sendmail. For other related information, you can see Additional Queue Features in Version 8.12 of sendmail.
Tasks for administering the mail queue are as follows:
Displaying the Contents of the Mail Queue, /var/spool/mqueue
Forcing Mail Queue Processing in the /var/spool/mqueue Mail Queue