Interesting, out of the blue, one of my users gets an error when trying to send email to another person within the same domain. The mail is not leaving the campus to the outside world. He can send to anyone else internally with no issues. He can even send email to this one person via webmail with no problems at all. Turning on logging I am seeing the following on the log for the one message:
2011.10.03 16:21:52 MAPI XP Call: SubmitMessage, hr = 0x80040502
2011.10.03 16:21:52 MAPI XP Call: SubmitMessage returned MAPI_E_NOT_ME.
The bounce message he is getting show the following. I changed the email addresses to a bobo one for privacy:
Delivery has failed to these recipients or groups:
A problem occurred during the delivery of this message. Please try to resend the message later.
Diagnostic information for administrators:
Keep in mind this is ONLY when sending through Outlook 2010. Webmail has no problems.