Is there a simple command to find out the current number of messages in the linux mail queue?
mailq dumps out a verbose list, but it's not convenient for a quick overview.
I'm using Ubuntu and postfix.
If you just want to know the number of messages sitting in the deferred queue, then the following should get you a quick answer:
There are three other queues. See http://www.porcupine.org/postfix/queueing.html for details.
As a related matter, you can also obtain the number of messages in your mailbox stored in mbox format, by modifying Brian Showalter's suggestion using the command "mail --headers." For example, I have this line in my .bashrc file: