Check the message tracking logs for NDRs, and/or suspend the queue and export some of those messages and figure out where there coming from.
What to do after that will depend on the message source, but you should be able to add a hub transport rule to drop them before they get to the queue until you get it sorted out. From: Jeff Brown [mailto:2jbr...@gmail.com] Sent: Wednesday, June 09, 2010 12:18 PM To: MS-Exchange Admin Issues Subject: undeliverables "clogging" que's We are in the middle of a multi-domain migration from E2k3 servers to E2K7. We had an outside consultant come in and set this all up. We had some time constraints and unrelated hardware issues that have complicated this process at times, and things have not always gone smoothly(imagine that). Everything seems to be working fine except that we have had reports of "missing email" and looked to find a que with hundreds of undelivered messages on the E2K7 Hub/CAS server. 80% or so of those messages are identified as "undeliverable". When we manually delete the undeliverables the rest of the messages seem to go out just fine. I'll be happy to provide more details about our setup, but I'm thinking that may be something someone else has seen and may be able to point us in the right direction to get this resolved??? thanks for any help. Jeff ************************************************************************************************** Note: The information contained in this message may be privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to the message and deleting it from your computer. **************************************************************************************************