The recipient verification needs to be on your externally exposed MTA for incoming email, so that would be the gateway filter I assume. The decent ones will do that through an LDAP connection (for example) to your exchange server. If not you are accepting all email for your domain...it hits the exchange server and invalid recipients are generating the outgoing NDR's on the exchange server. I really really think that is the root of your problem here. That flood of stuck outbound NDR's is hanging everything else up.
From: Jeff Brown [mailto:[email protected]] Sent: Wednesday, June 09, 2010 1:53 PM To: MS-Exchange Admin Issues Subject: Re: undeliverables "clogging" que's we are currently not doing any filtering with exchange, but we have a gateway filter appliance and are running a symantec filter on the mailbox server. On Wed, Jun 9, 2010 at 12:43 PM, Campbell, Rob <[email protected]<mailto:[email protected]>> wrote: Did your "consultant" not set up any spam filtering? It sounds like you're either wide open, or infected internally. From: Jeff Brown [mailto:[email protected]<mailto:[email protected]>] Sent: Wednesday, June 09, 2010 12:35 PM To: MS-Exchange Admin Issues Subject: Re: undeliverables "clogging" que's The From: seems to by typical spam, spoofed addresses, predictable subject lines. The To: seems to vary, some to current employees, some to former employees and some to unknowns... On Wed, Jun 9, 2010 at 12:31 PM, Kennedy, Jim <[email protected]<mailto:[email protected]>> wrote: The undeliverable's are from who and to who? Is there a common thread with them? From: Jeff Brown [mailto:[email protected]<mailto:[email protected]>] Sent: Wednesday, June 09, 2010 1:18 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. **************************************************************************************************
