yeah...it happened today...details:
The original message was received at Fri, 22 Apr 2011 12:06:47 -0400
from mtaomg-ma06.r1000.mx.aol.com [172.29.41.13]
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----- The following addresses had permanent fatal errors -----
(reason: 550 sorry, no mailbox here by that name. (#5.7.17)
)
----- Transcript of session follows -----
... while talking to mail.evcforum.net.:
>>> DATA
<<< 550 sorry, no mailbox here by that name. (#5.7.17)
550 5.1.1 ... User unknown
<<< 503 RCPT first (#5.5.1)