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SBS Server MSExchange smtp queues have frozen messages and also received NDR shown in body of question from another domain.

Posted on 2010-09-02
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Last Modified: 2013-11-30
The following recipient(s) could not be reached:
      someuser@recipientdomain.com on 9/2/2010 2:36 PM

There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
<myserver.local #5.5.0 smtp;554 Denied (Mode: normal)>

This all began after some network (dsl modem, firewall) changes and supression of a spambot attack (cutwail) that had my client blacklisted for a few days.  After configuring FW rules to prevent SMTP outbound from any but the SBS server I delisted and most email is flowing freely.

The stuck messages are still retrying from what I can see in firewall activity on port 25 and I did enable verbose logging for the SMTP process.

Is this just a matter of having to get in touch with the affected domains to request delisting internally?

Thanks.

bc
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Question by:bchesley
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4 Comments
 
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Expert Comment

by:davorin
ID: 33592006
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Author Comment

by:bchesley
ID: 33592137
Thanks for these links.  I had read both and tried changing the smtp domain setting to the external domain as it was set to an internal address (NAT in firewall).  

I also was exploring this link http://technet.microsoft.com/en-us/kb/kb.aspx?id=324958#6
specifically the section titled 'Clean up the Exchange Server's SMTP queues' which seems to indicate that I just have to delete the stuck queue messages.  I did verify that the server was not an open relay server so it should not be allowing any spam through.  When I drill into the queued messages they are all legitimate from and to addresses.
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LVL 27

Accepted Solution

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davorin earned 2000 total points
ID: 33594028
If you have solved your attacks it is time to contact administrators of that domains.
You could also use www.mxtoolbox.com to check if base settings are fine on your server.
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LVL 2

Author Closing Comment

by:bchesley
ID: 33595966
Blacklisting information was spot on but response did not address frozen outbound queue aspect of inquiry.
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