[thelist] mail loops, Mail.app bounce to sender

Erik Mattheis gozz at gozz.com
Sat Mar 8 17:43:01 CST 2003

What happens when a spammer uses a non-existing address to send spam to
a non existing address? How do the mail servers avoid getting locked in
an infinite loop? Like I keep on getting this ... trimmed it so you can
get to the punch-line quicker ...

From: MAILER-DAEMON at home.ro
Date: Sat Mar 8, 2003  8:00:22  AM US/Central

<MAILER-DAEMON at home.ro>: does not like recipient.
Remote host said: 553 no such user (#5.5.1)

--- Below this line is a copy of the message.

Return-Path: <gozz at gozz.com>
Subject: Returned mail: User unknown
To: MAILER-DAEMON at home.ro

Erik Mattheis
GoZz Digital
Flash and ColdFusion Development
Minneapolis, MN

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