qshape
A tool for analyzing messages in postfix’s various queues. eg What domain’s they’re going to, and how long they’ve been there
# To list messages all messages by domain
# sudo qshape
T 5 10 20 40 80 160 320 640 1280 1280+
TOTAL 1714 4 5 141 4 256 22 56 1218 7 1
gmail.com 1714 4 5 141 4 256 22 56 1218 7 1
Links
mailq
Get me a list of messages currently in the active queue (and possibly other queues eg hold)