Returned mail: see transcript for details

[Mail Delivery Subsystem]

The original message was received at Mon, 3 Sep 2012 09:20:58 +0200
from triband-mum-59.182.143.138.mtnl.net.in [59.182.143.138]

   ----- The following addresses had permanent fatal errors -----
<fp at informatik.uni-frankfurt.de>
    (reason: 550 5.1.1 <fp at informatik.uni-frankfurt.de>... User unknown)

   ----- Transcript of session follows -----
... while talking to mail.informatik.uni-frankfurt.de.:
>>> DATA
<<< 550 5.1.1 <fp at informatik.uni-frankfurt.de>... User unknown
550 5.1.1 <fp at informatik.uni-frankfurt.de>... User unknown
<<< 503 5.0.0 Need RCPT (recipient)
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