Subject: Returned mail: see transcript for details

From: "MAILER-DAEMON" <[email-masked]>
Date: Mon, 18 Jul 2005 09:42:11 +0200

The original message was received at Mon, 18 Jul 2005 09:42:11 +0200
from ietf.org [79.171.21.74]

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

----- Transcript of session follows -----
... while talking to ietf.org.:
>>> MAIL FROM:"MAILER-DAEMON" <[email-masked]>
<<< 506 User blacklisted