Distribution list failure at categorizer

mm925
mm925 used Ask the Experts™
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I have a particular distribution list group (global and distribution in Win2k AD) on Exchange 2000 SP3 that occassionally fails to be delivered to the members.  Using message tracking I can see that the failed email reaches the Categorizer and processing stops.  If specific users are also included on the email they will receive the message, just not the distribution list.  I have changed the expansion server to various different servers, but the problem is occurs.
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Commented:
You may want to turn up logging to 7 in the registry, changing the log level to maximum in ESM only sets it to level 5 and you could miss something. Changing this setting should post the reason why the email failed in the event log. Maybe if you can post the errors you get in the event log we can be more help.

http://support.microsoft.com/?kbid=262308
I assume, you have one Exchange Server. Have you simply tried to recreate the group? You should also track, if the failing mails are coming from special senders or special domains. Maybe that something within the mail is not RFC conform and Exchange has problems with that. Can you describe a little bit more precise, you environment and failure conditions. Members of the grpoup internal or external, failing senders internal or external, last patches installed...

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