[Rivet] Returned mail: see transcript for details

[Mail Delivery Subsystem]

The original message was received at Fri, 16 Nov 2012 11:38:54 GMT
from mail.phyip3.dur.ac.uk [129.234.186.130]

   ----- The following addresses had permanent fatal errors -----
<jmonk at fnal.gov>
    (reason: 550 5.1.1 User unknown)

   ----- Transcript of session follows -----
... while talking to ex-smtp.fnal.gov.:
>>> DATA
<<< 550 5.1.1 User unknown
550 5.1.1 <jmonk at fnal.gov>... User unknown
<<< 503 5.5.2 Need rcpt command
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