We have had two instances where mail that is sent to a "Distribution List" don't appear. The sender doesn't even receive a NDR. When you use the Message Tracking Centre to track the message you will see the following track.
SMTP: Message Submitted To Advanced Queuing
SMTP: Started Message Submission to Advanced Queue
SMTP: Message Submitted to Categorizer
It transpires that the Categorizer is the part which checks for viruses so usually in this case you would first check the Virus software. In this case however, we use no such mail scanning facility as its done before the mail reaches the server via Postini and Message labs.
After trawling through hundreds of posts, all I needed to do was change the Group Scope of the Distribution list from Global to Universal. Then all of a sudden it worked.
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