From: "MAILER-DAEMON" <[email-masked]>
Date: Tue, 5 Jul 2005 13:10:05 -0700

The original message was received at Tue, 5 Jul 2005 13:10:05 -0700 from ietf.org [127.151.168.4]

----- The following addresses had permanent fatal errors -----
<[email-masked]>

----- Transcript of session follows -----
... while talking to 140.96.105.237:
>>> MAIL FROM:"MAILER-DAEMON" <[email-masked]>
<<< 504 "MAILER-DAEMON" <[email-masked]>... Address unknown