A new discovery. I have gone through the SMTP logs and there are many occurrances of invalid addresses. The odd thing is that they all contain our domain, but here is the funny thing. The usernames all appear to be either first names, last names concatinations of the two or misspelled usernames of people who exist on either our IMail server or our Exchange server. Could there be a virus at work here or some kind of attack? It all seems very weird.
That's called a dictionary attack, and is very, very common these days. It is used by spammers to find addresses on your domain to spam.
-Scott
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