We have a user that has his emails forwarded through our domain to a Comcast account. It seems as though everything that is coming in through his user@ourdomain account is being duplicated, or sometimes, more than just duplicates. We have tried deleting the mailbox (where the forward is set), deleting the contact (where his outside email is set, the Comcast account) and we've made sure that it's not an Outlook issue by verifying that there are definitely duplicates in his Comcast account. I turned on SMTP logging which I'll paste part of that seems odd: <,MAIL FROM:user@ourdomain.com, *,08CD3B3A29A867A6;2010-11-12T14:43:27.125Z;1,receiving message >,250 2.1.0 Sender OK, <,RCPT TO:user@aourdomain.com, ,>,250 2.1.5 Recipient OK, It seems odd that it would be from and to the same person. This is from the Receive SMTP logs. Thank you for your time!

> We have tried deleting the mailbox (where the forward is set), deleting the contact (where his outside email is set, the Comcast account) > Do you have two object for user in your domain, this is confusing me here. how really email being forward to external mailbox. you can setup forward at mailbox and keep one mesage in your doamin also, secondry you can just create one contact for external SMTP address which will just forward. Anil

We have exchange mailbox address that is forwarded to a contact, which sounds like what you are saying as a secondary option. It does not keep anything on the server, it is all forwarded off to the contact email address, off site. Does that help?

And looking at what I had written before, both of those email addresses from the SMTP RCV log should be the same, that's what I'm finding odd.

Hi, How does the receiver connect to the Comcast account, via Office Outlook or Outlook Express? To troubleshoot the issue, please perform the following steps. 1. Perform a clean boot to disable third party application on the Exchange Mailbox client. Note: A Clean Boot will allow us to isolate any device drivers or programs that are loading at startup that may be causing a conflict with other device drivers or programs that are installed in your computer. a) Start the machine on the problematic machine and type MSCONFIG.EXE in Run Command in Start menu. b) In the Services tab, click "Hide All Microsoft Services" and click "Disable All". c) In the Startup tab, click "Disable All". Click OK. (This will temporarily prevent third-party programs from running automatically during start-up.) d) Restart the computer. Does the problem still persist? If the problem does not occur, it indicates that the problem is related to one application or service we have disabled. You can use the MSCONFIG tool again to re-enable the disabled item one by one to find out the culprit. 2. Login on the mailbox on another machine with the same contact and check whether you can receive duplicate emails again. 3. Temporarily disable all Outlook rules to check the result. If the issue persists, I suggest you refer to the following article to configure Transport Message Tracking and post the whole log file here for research. Configure Message Tracking Thanks.Novak Wu-MSFT