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

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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bchesleyAsked:
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davorinConnect With a Mentor Commented:
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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bchesleyAuthor Commented:
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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bchesleyAuthor Commented:
Blacklisting information was spot on but response did not address frozen outbound queue aspect of inquiry.
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