Our company is using Microsoft Exchange 2003 SP2 as our email server.
We are receiving 100s of emails from other domain users each day.
We have a couple of other domain email people who are trying to send us email, but say that they are receiving the message: "Recipient address rejected: User unknown in virtual alias table"
We can send email to them, but when they reply, they receive the message above.
I am unable to find anything in the event log or via Message tracking center for the user@outsidedomain who are receiving the message above.
How can I track this and resolve it?
Thanks in advance.