Last time I saw something like this, it was employees with Out Of Office messages sent out into the world rather than limiting them to internal recipients or Contacts. They got sent to spammers who then used them for NDR's and spoofs.
It might be a case where your network is secured but you just have to deal with the pains of the NDR's until they eventually die down, which they will. Jay Dale I.T. Manager, 3GiG Mobile: 713.299.2541 Email: jay.d...@3-gig.com<mailto:jay.d...@3-gig.com> Confidentiality Notice: This e-mail, including any attached files, may contain confidential and/or privileged information for the sole use of the intended recipient. If you are not the intended recipient, you are hereby notified that any review, dissemination or copying of this e-mail and attachments, if any, or the information contained herein, is strictly prohibited. If you are not the intended recipient (or authorized to receive information for the intended recipient), please contact the sender by reply e-mail and delete all copies of this message. 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
