Returned mail: Data format error

[guy () alum mit edu]

The original message was received at Sun, 17 Dec 2017 15:43:17 +0800
from alum.mit.edu [191.156.140.117]

----- The following addresses had permanent fatal errors -----
<tcpdump-workers () lists tcpdump org>

----- Transcript of session follows -----
  while talking to lists.tcpdump.org.:
> > > MAIL From:guy () alum mit edu
<<< 501 guy () alum mit edu... Refused



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