I have an Exchange 2003 standard server running on a simle and small AD network. When a single user on the system sends a message to some external recipients, the message sent also gets delivered to the senders local exchange mailbox. It doesn't happen with every external recipient, but with several recipients. Most of which have email addresses ending in verizon.net. I can't find any exchange settings or AD profile options that would account for this user receiving an actual copy of the message they are trying to send to an external recipient. Here is what is happening step by step
1. user composes an email to an external recipient, outside of the exchange org (which AD and Exchange had generic internal names)
2. User types message and verifies that only this one recipient is selected to receive the message in the "To" field.
3. user hits send, and the message sends through outlook...
Now if I look in message tracking I can see where the queue actually queues the mail twice, it goes through the categorizer and gets routed for external delivery, but then it starts over and goes back through the queue and this time appends with being delivered locally to the senders address. The last line shows the message getting sent via SMTP externally, so the recipient still gets the message, but the sender gets a copy too, even though the sender did not send the message to himself.
Does this make any sense to anyone, where would I begin to troubleshoot this? I've already checked all through my exchange server settings and AD user properties for the mailbox, I don't see anything wrong or anything that would explain why this is happening, I can only tell that it is happening and the message tracking center that its queuing twice. Again, this does not happen for every recipient this sender sends mail to. Very puzzling. You can see a screenshot of the message tracking center at http://www.shorehost.com/Message.jpg
which shows the message getting queued twice.
I tried sending a message to this same recipient from my mailbox and did NOT receive a copy back to myself. So its just something with this one mailbox. The message tracking center only had half the content of the screenshot for the instance of when I sent the message, showing only a single delivery.