Nothing in the message tracker that could indicate a problem. No return errors. Just some people in a distribution list who may or may not be on the same server it doesn't matter are not getting email. What could be causing this?

What does message tracking show? More info required. Generally when messages to a DL are not delivered, my first thought is to ensure that the DL is a universal group.

Hi, Please check whether the below article can help you: http://support.microsoft.com/default.aspx?scid=kb;EN-US;271930 Thanks Allen