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 from Exchange's rate-limiting, which was my first thought. I've done a little googling and I keep coming across this article: http://www.heinlein-support.de/blog/mailserver/postfix-verify-liefert-lost-connection-an-exchange-2010-sp1/ . It's in German, but google translate makes enough sense of it that I'm tempted to turn off pipelining to that exchange box anyway even though this isn't verification related. Anyone hear of this before? It's probably Exchange's fault not postfix. It doesn't happen enough to be a huge problem but it's maddening all the same. Thanks, Aaron --- Aaron Bennett Manager of Systems Administration Clark University ITS
