On 9/24/2012 3:03 PM, Aaron Bennett wrote: > Hi, > > > > I’m running 2.3.3 on CentOS 5 as a mail relay; most of my mail is > delivered to an internal Exchange 2010 environment with two Hub > Transport machines clustered behind Windows NLB under the same > hostname. > > > > I’m seeing sporadic – and by sporadic I mean two or three intervals > per month – when all mail relayed to the internal environment > fails. Postfix logs: > > > > Sep 24 11:58:01 megalon.clarku.edu postfix/qmgr[28063]: BA1362E778B: > to=<systemsmonit...@clarku.edu>, relay=none, delay=0.06, > delays=0.05/0/0/0, dsn=4.4.2, status=deferred (delivery temporarily > suspended: lost connection with exchange.clarku.edu[140.232.254.129] > while receiving the initial server greeting) > > > > This lasts for a little under 20 minutes and usually effects more > than one of our mail relays. I have exempted all of our mail relays
I have no idea what causes the failures, but maybe you can minimize the delays. Note that the log snip you shared is from the queue manager, and says "delivery temporarily suspended." Once that happens, postfix won't even attempt another delivery for a while. This might be helpful in minimizing the impact of random delivery failures: http://www.postfix.org/QSHAPE_README.html#backlog -- Noel Jones
