English
Italianomail forwarding loop
Some time ago I found another oddity diving in the big sea of spam messages. Suddenly, I started to receive the following errors:
From: Mail Delivery System <MAILER-DAEMON@xxxxx.xx>
To: postmaster@xxxxx.xx
Subject: Postmaster Copy: Undelivered Mail
Date: Tue, 12 Jun 2007 11:41:15 +0200 (CEST)
Content-Description: Notification
<scass@xxxxx.xx>: mail forwarding loop for scass@xxxxx.xx
Content-Description: Delivery report
Reporting-MTA: dns; mx.xxxxx.xx
X-Postfix-on-Linux--i386--Queue-ID: CEA9EB40F1
X-Postfix-on-Linux--i386--Sender: rfc822; gqmq@xxxxx.xx
Arrival-Date: Tue, 12 Jun 2007 11:41:14 +0200 (CEST)
Final-Recipient: rfc822; scass@xxxxx.xx
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix-on-Linux--i386-; mail forwarding loop for
scass@xxxxx.xx
Content-Description: Undelivered Message Headers
Received: from catv-50636fd7.catv.broadband.hu (catv-50636fd7.catv.broadband.hu [80.
99.111.215])
by mx.xxxxx.xx (Postfix on Linux (i386)) with SMTP id CEA9EB40F1
for <scass@xxxxx.xx>; Tue, 12 Jun 2007 11:41:14 +0200 (CEST)
X-Original-To: scass@xxxxx.xx
Delivered-To: scass@xxxxx.xx
Received: from [80.99.111.215] (port=21760 helo=catv-50636fd7.catv.broadband.hu)
by mx1.xxxxx.xx with esmtp
id 433054-433054-08
for scass@xxxxx.xx; Tue, 12 Jun 2007 11:41:19 +0100 (EET)
Message-ID: <499701c7ace6$01c7ace6$d76f6350@xxxxx.xx>
From: "Gerry" <gqmq@xxxxx.xx>
To: "Duane" <scass@xxxxx.xx>
Subject: financier than ankara
Date: Tue, 12 Jun 2007 11:41:19 +0100 (EET)
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_NextPart_001_4994_01C7ACD5.D4476A10"
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2900.3028
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028
Why there is a forwarding loop? I spent some time checking all the postfix's configuration file and everything looked good.
So I gave a closer loop at the email... it seems that the remote server
sent an email with the Delivered-To: header set to the recipient, which
then triggers the error notified.
From the local(8) manpage:
In order to stop mail forwarding loops early, the software
adds an optional Delivered-To: header with the final enve-
lope recipient address. If mail arrives for a recipient
that is already listed in a Delivered-To: header, the mes-
sage is bounced.
Nothing to really worry about...
