This was posted in the newsgroup but may be better suited here:I have an active account on our Exchange server which is able to send /receive mail with no problems and does not have any delegates or forwardingrules. When someone sends a message to the account, they get an NDR from a differnt account that was once used for testing and has since been disabled / deleted.The message is actually received by the active account but everyone who sends to itthinks that it'snot going throughbecause of the NDR. The Exchange Server logshows:Source: MSExchange TransportCategory: NDREvent ID: 3012In the description it has a statuscode of 5.1.7 Where do I find what is causing the message to deliver to both mailboxes andhow do I make it stop going to the wrong one? Any assistance is appreciated.

Hello,There could be two reasons...1. Are senders getting NDRs only when they send meeting or calendar invitations?You may need to hunt for some stale delegates rules with MFCMapihttp://social.technet.microsoft.com/forums/en-US/exchangesvrgeneral/thread/8ef3fa80-7692-4402-b788-39774a2e81e9/2. Are sender getting NDRs when sending all kind of mails?Follow below article to cleanup your outlook rules...Delete Corrupted, Hidden or Stale rules from mailbox with MFCMapihttp://exchangeshare.wordpress.com/2008/04/10/delete-corrupted-hidden-or-stale-rules-from-mailbox-with-mfcmapi/Amit Tank | MVP - Exchange | MCITP:EMA MCSA:M | http://ExchangeShare.WordPress.com

Thanks for the reply and information. I checked theaccount using the tool and didn'tfind any items with theMessage Class IPM.Rule.Message. I did, however, find that the Exchange site DC hadn't replicated the change where the forwarding to that account was removed. The account was recently disabled and the bouncebacks began! Thanks for your help!