Flush sendmail queue

I just found out about this feature for flushing the sendmail queue. This is useful if, say, your mail server was down all weekend and you JUST CAN'T WAIT for the normal queue flush to occur because you've gone through email withdrawal by not being connected for a couple days. In the event that you, say, just rebuilt your mail server and wanted to make sure everything was working correctly you'd also want to watch the queue as it's processing. Normally you'd just run the following to flush the queue and see the results:

/usr/sbin/sendmail -q -v