From: Dave McGuire (mcguireneurotica.com)
Date: Fri Aug 17 2007 - 10:56:17 CDT

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   Hi folks. I have a production mail server that has been badly
constipated since yesterday afternoon and I'm trying to figure out
why. I could really use a little help if someone has a moment.

   The basic configuration is a front-end system running Postfix
v2.4.0, with amavisd-new/SpamAssassin/ClamAV, which filters mail and
then sends it along to multiple destinations via transport maps, one
of which is a second machine on the local network also running
Postfix v2.4.0. Pretty much everything for both of these machines is
stored in a MySQL server running on a third system.

   They've been running great for many months, with no recent
configuration changes that I am aware of, but suddenly the active
queue on the front-end machine has become large, around 10K messages
and climbing, and very little mail is getting past the frnot-end
machine. I see no obvious problems in the logs.

   A quick run of "qshape active" suggests that a large volume of
mail destined for the second server mentioned above is sitting in the
active queue for reasons unknown. The second server is on the local
network, is under very little load, and is working fine otherwise. I
can telnet to port 25 on that box and manually send stuff through;
everything behaves as expected.

   I can't seem to figure out why the front-end machine is having
trouble sending messages to the destinations configured in the
transport map, even the one that's local, fast, and not busy. It
acts as if it's not even trying. Is there some way to get some
visibility into what Postfix is doing in that regard? I've checked
over the logs and spotted nothing useful, but of course the log
messages are blowing by so fast (as usual) that finding anything in
there is rough.

   I can post configs if needed.

             Thanks,
             -Dave

--
Dave McGuire
Port Charlotte, FL
Farewell Ophelia, 9/22/1991 - 7/25/2007

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