Since I began managing sendmail installations 8-years ago, I have used the mailq command to print the entries in the sendmail queue. While reading through the bat book to find the root cause of my sendmail DNS problems, I came across sendmail's "-bp" option:
$ /usr/sbin/sendmail -bp
/var/spool/mqueue is empty
Total requests: 0
This provides the same results as the mailq command:
$ mailq
/var/spool/mqueue is empty
Total requests: 0
I am still amazed at how complex the sendmail program is. Rule 0, Rule 3, Rule 5, 8000 macros ... ge gads!