Re: Getting NDR with status 5.3.0

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Copying and pasting my post to a similar problem.
 
Okay. You're probably getting an event ID 3015, which is derived from an SMTP 5.3.0 NDR.
 
This can happen when you have anomalies in the transport that result in mail erroneously going to the MTA transport instead of SMTP...if this is the case, your users may not be receiving mail, and you'll visibly see messages resulting in 5.3.0 NDRs back to internal or external senders.
 
Also, some foreign implementations of SMTP use the 5.3.0 as a delivery status notification for various issues, and if your server attempts to send mail to one of such domains and gets a 5.3.0 NDR back, then this event ID will show up in your logs also.
 
If you dont sense any problems in your environment with sending or receiving mail, it may be the latter described problem, and you simply have to turn down transport diagnostic logging.
 
In your case, the latter is the problem, and you can safely ignore the event ID and turn transport loggign down to none.
 
Hope this helps.
Hi, all.

I'm having problems with my SBS2003 system. I've tried reading the
support-pages for the error I'm receieving, but cannot make anything out of
it. I'm really in the blue, here.

The problem occurs when my users try to send mails to a specific domain
aaa.xx (it occurs only for this domain), it seems it only appears when the
recipients to aaa.xx is part of a mail to several recipients (to other
domains).

What I get in the Application Event Log is

---

A non-delivery report with a status code of 5.3.0 was generated for
recipient rfc822;theuser@xxxxxx (Message-ID
<AEE1EC6506FF364AA0FED88265B66299019712@xxxxxxxxxxxxxxxxxxxxxxxxx>).  
Causes: Exchange mistakenly attempted mail delivery to an incorrect MTA
route. 
For more information, click http://www.microsoft.com/contentredirect.asp.   
Solution: Check your route and topology; use the winroute tool to ensure the
routes are properly replicated between servers and routing groups.

----

(I've tried using the winroute-tool, but can't make anything out of it,
actually...)

So I look at the tracking. The mail was sent to 2 local users, and three other
users of different domains, including 1 to aaa.xx. Lets call the other domains
bbb.xx and ccc.xx.

The local users receive the mail without errors. Then the problem appears:

SMTP: Started Outbound Transfer of Message
Message transferred to mailtx.bbb.xx through SMTP
SMTP: Started Outbound Transfer of Message
SMTP: Non-delivered report (NDR) Generated          <== HERE
SMTP: Started Outbound Transfer of Message
Message transferred to mailtx.ccc.xx through SMTP

It seems like the server is not performing a lookup of the correct MTA for
aaa.xx, and just sends the mail to mailtx.bbb.xx instead. If this is the case,
no wonder I get a "...we do not relay"-message.

Hope I'm making myself clear, here. I can include the saved xml from
the Message Tracking if necessary, just seemd a bit overkill right now.

Really need some input on this. Appreciate any help.

Regards,
Lars

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