On 02/28/2016 07:29 AM, Ruben Safir wrote:
No, I mean I send messages and they don't show up for a half hour even in the postfix logs....
Assuming Mailman 2.1.x, the usual cause of this is a backlogged 'out' queue in Mailman. Look at Mailman's 'smtp' log, and look at how many files are in Mailman's qfiles/out/ directory (/var/spool/mailman/out in some packages).
If there are more than one or two files in the out/ queue, and if the smtp log has successive entries of the form
Feb 28 08:55:43 2016 (30307) <mesage-id> smtp to list for nnn recips, completed in t.ttt seconds
with each messages time stamp being t.ttt seconds later than the preceding message, the out/ queue is backlogged. If that is the case, Mailman isn't able to deliver fast enough to Postfix to keep up with it's volume.
Even with full VERP, Mailman should be able to deliver tens of messages per second to Postfix. If it is slower than that, there is a n issue with delivery. Once we have more info on whether the queue is backlogged and what the delivery rate is, we can say more. You might find some of the hits from the google search
site:mail.python.org inurl:mailman backlogged out queue
of interest.
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan