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From: Jimbo (jimjamesberwick.com)
Date: Fri Apr 04 2008 - 10:18:39 CDT
Rocco Scappatura wrote:
>> This message shows 10.3.253.16 (Assuming that is your
>> Exchange server) resending the message multiple times.
>> Postfix is rejecting the message multiple times with a 450
>> error. It looks like you may have one of your
>> unknown_*_recipient_reject_code parameters set to a 450 (try
>> again) error instead of a 550 (permanent failure).
>> Eventually that message will expire in your Exchange queue
>> and you'll get an NDR. Fix your reject codes and you should
>> get an immediate NDR next time.
> I'm sorry but I already have:
> unknown_local_recipient_reject_code = 550
Is it a local recipient? It looks like you might need to set
unverified_recipient_reject_code = 550 in main.cf.