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



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