Thanks, Wietse. At this stage it is working again. I think you are right, it must be something downstream because when I relayed the mails from the queue to another mail server, all went through ok. I have a suspicion it might be the spam filter on the Exchange server (was told it runs Trend's ScanMail) If it happens again, I'll follow the instruction to debug :)
-----Original Message----- From: owner-postfix-us...@postfix.org on behalf of Wietse Venema Sent: Fri 8/27/2010 9:08 PM To: Postfix users Subject: Re: Another "timed out while sending end of data" Error Lie, Jafaruddin: > Hi Wietse > 1. No "220 *********************2******0******200*****02*****0*00" when > telneting into the Exchange server: > > [r...@mailinglist]~# telnet x.x.1.74 25 > Trying x.x.1.74... > Connected to x.x.1.74 (192.168.1.74). > Escape character is '^]'. > 220 xx.xx.edu.au Microsoft ESMTP MAIL Service, Version: > 6.0.3790.4675 ready at Fri, 27 Aug 2010 11:35:55 +1000 There is no problem in Postfix that causes sessions to block, so it is a problem down-stream. You can record a session ON THE POSTFIX HOST with tcpdump (www.postfix.org/DEBUG_README.html) and see that the sending side is not in error. Wietse ------------------------------------------------- Please consider the environment before you print