check_mailqueue.pl

check_mailqueue.pl [-d] [-h] -w -c

-w, –warning warning threshold – mails in queue
number of mails in queue > time
ex: 30=3d,100=3h
-c, –critical critical threshold – mails in queue
number of mails in queue > time
ex: 30=3d,100=3h
-d, –debug enable debug mode
-h, –help show help message

warning and critical threshold:
specify something like 100=5h which means: more than 100 mails in queue for more than 5 hours. You can specify multiple declarations
for instance
-w 100=5h,30=3d,10=10d -c 150=5h,35=3d,15=10d