Hello, As of today I suddenly have messages accumulating in the Messages awaiting directory lookup queue. It seems to just keep building. I have at least 4000 messages in the queue. Mail flow has come pretty much to a stand still. I have checked by Domain Controllers and GCs and I don't seen anything obviously wrong. This is happening on my front-end servers (exchange 2003 sp2 running on windows 2003 sp1. Sybari Antigen antivirus. Thanks in advance. Bill