Anyone outside my domain who sends me an email is getting a bounced email with the following error from Exchange:

550 550 5.1.1 myusername@mycompany.com is not a valid mailbox (state 14).

I can't receive emails from external addresses until I send an email to one of my secondary addresses. Once I sent it to my secondary address, my primary address will start working for a while and fail again after a few hours.

We use Exchange 2003. Anyone has any suggestions on what to try?


That doesn't look like an Exchange 2003 NDR. What's the reporting MTA in the NDR? Do you use a third party filter in front of the Exchange server or on the Exchange server?

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