RE: Inbound mails sometimes refused with "550 5.7.1"

From: Darin Roulston [MSFT] (darinr_at_online.microsoft.com)
Date: 10/07/04 

Date: Thu, 07 Oct 2004 15:55:45 GMT

Hello Marcelo,

Can you reply with the complete text of a sample NDR than external
recipients receive when they send to you, there is normally some more
information before the 550. In the NDR is it your server name issuing the
NDR? First thing to check on the SMTP virtual server Access tab is the
Authentication and Connection subbuttons. Is anything set other than
default, if so what? Also what is between yourself and the internet? If
you can get the problem to reproduce, it would be very useful to have a
netmon trace of the problem or at a minimum SMTP protocol logging on the
Virtual Server to see more of what is going on in the SMTP conversation.

Darin Roulston
Microsoft 

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I have only one Exchange2k server. Approximately since two 
weeks ago it started rejecting inbound traffic from 
several domains. The NDR message the sender receives is 
regularly similar to the following: "550 5.7.1. Requested 
action not taken: message refused". The situation not 
always replicates the same, as mails, previously accepted, 
become rejected and after a while (not always, but 
sometimes) become accepted. Nothing has changed at the 
server ever since. There are two related articles 
(KB288593 and KB323669) that might probably be connected 
to the problem, however I´m still not pretty sure they 
apply and even doubtfully about what should I do, 
especially regarding kb288593, which doesn´t clearly 
states "how to" steps in the resolution.
thanks in advance. Marcelo.
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