Hi Experts -
This is a weird one. I have a user that is getting a bounce back when she receives email from internal senders. The senders do not get a bounce back however. So if I send her an email, she gets the original email, but then she immediately gets an NDR with error "#550 5.1.1 RESOLVER.ADR.ExRecipNotFound". Below is some further information obtained from the NDR itself. I've replaced the sensitive info but have not modified anything else.
From: USER.NAME <USER.NAME@DOMAIN.com>
As you would expect, this appears to be an issue with caching (The IMCEAEX string leads me to believe that), but nothing I try is helping the situation. I've cleared her NK2 file, added her LegacyExchangeDN value as an X500 address, and quite a few other little things in hopes to fix this. Nothing has worked.
Remember, this happens when she receives an email, not when she sends one. I had the assumption that maybe some how her email was being forwarded to an old/non-existent account of hers, but everything is clear as far as I can see. No delegates assigned, no forwarding set up, etc. Any help here would be hugely appreciated. Thanks!
Exchange 2010, SP2, Update 8