John te Bokkel / Tempus:
> I am not sure why this is happening now, I haven't made any changes to
> configurations in the last while.

The Postfix local delivery agent will report a loop when it tries
to deliver mail to u...@example.com, and that message already has
a "Delivered-To: u...@example.com" message header.

You can disable ADDING the Delivered-To header, but you cannot
disable TESTING for the header's presence.


        Wietse
> 
> Here is an example of an email that got bounced. It was sent locally
> in a backup script.
> 
> 
> 
> >From MAILER-DAEMON  Fri Oct 16 12:31:13 2009
> Return-Path: <>
> X-Original-To: j...@localhost.powercoreeng.com
> Delivered-To: j...@localhost.powercoreeng.com
> Received: by server (Postfix, from userid 1013)
>       id 56D23272C9A; Fri, 16 Oct 2009 12:31:13 -0400 (EDT)
> X-Spam-Checker-Version: SpamAssassin 3.2.1-gr1 (2007-05-02) on server
> X-Spam-Level:
> X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,NO_RELAYS
>       autolearn=ham version=3.2.1-gr1
> Received: from localhost (localhost [127.0.0.1])
>       by server (Postfix) with ESMTP id ECB5B272C95
>       for <j...@localhost>; Fri, 16 Oct 2009 12:31:12 -0400 (EDT)
> X-Original-To: r...@powercoreeng.com
> Delivered-To: r...@powercoreeng.com
> Received: from localhost [127.0.0.1]
>       by localhost with IMAP (fetchmail-6.3.11)
>       for <j...@localhost> (single-drop); Fri, 16 Oct 2009 12:31:12 -0400 
> (EDT)
> Received: by server (Postfix)
>       id D761F272C97; Fri, 16 Oct 2009 12:26:12 -0400 (EDT)
> Date: Fri, 16 Oct 2009 12:26:12 -0400 (EDT)
> From: mailer-dae...@powercoreeng.com (Mail Delivery System)
> Subject: Undelivered Mail Returned to Sender
> To: r...@powercoreeng.com
> Auto-Submitted: auto-replied
> MIME-Version: 1.0
> Content-Type: multipart/report; report-type=delivery-status;
>       boundary="C9994272C9A.1255710372/server"
> Message-Id: <20091016162612.d761f272...@server>
> 
> This is a MIME-encapsulated message.
> 
> --C9994272C9A.1255710372/server
> Content-Description: Notification
> Content-Type: text/plain; charset=us-ascii
> 
> This is the mail system at host server.
> 
> I'm sorry to have to inform you that your message could not
> be delivered to one or more recipients. It's attached below.
> 
> For further assistance, please send mail to postmaster.
> 
> If you do so, please include this problem report. You can
> delete your own text from the attached returned message.
> 
>                    The mail system
> 
> <j...@localhost.powercoreeng.com>: mail forwarding loop for
>     j...@localhost.powercoreeng.com
> 
> --C9994272C9A.1255710372/server
> Content-Description: Delivery report
> Content-Type: message/delivery-status
> 
> Reporting-MTA: dns; server
> X-Postfix-Queue-ID: C9994272C9A
> X-Postfix-Sender: rfc822; r...@powercoreeng.com
> Arrival-Date: Fri, 16 Oct 2009 12:26:12 -0400 (EDT)
> 
> Final-Recipient: rfc822; j...@localhost.powercoreeng.com
> Action: failed
> Status: 5.4.6
> Diagnostic-Code: X-Postfix; mail forwarding loop for
>     j...@localhost.powercoreeng.com
> 
> --C9994272C9A.1255710372/server
> Content-Description: Undelivered Message
> Content-Type: message/rfc822
> 
> Received: by server (Postfix, from userid 1013)
>       id C9994272C9A; Fri, 16 Oct 2009 12:26:12 -0400 (EDT)
> X-Spam-Checker-Version: SpamAssassin 3.2.1-gr1 (2007-05-02) on server
> X-Spam-Level:
> X-Spam-Status: No, score=-2.6 required=5.0 tests=AWL,BAYES_00,NO_RELAYS
>       autolearn=unavailable version=3.2.1-gr1
> Received: from localhost (localhost [127.0.0.1])
>       by server (Postfix) with ESMTP id A1EC1272C95
>       for <j...@localhost>; Fri, 16 Oct 2009 12:26:12 -0400 (EDT)
> X-Original-To: j...@localhost.powercoreeng.com
> Delivered-To: j...@localhost.powercoreeng.com
> Received: from localhost [127.0.0.1]
>       by localhost with IMAP (fetchmail-6.3.11)
>       for <j...@localhost> (single-drop); Fri, 16 Oct 2009 12:26:12 -0400 
> (EDT)
> Received: by server (Postfix, from userid 1013)
>       id 0B09D272C9C; Fri, 16 Oct 2009 12:21:13 -0400 (EDT)
> Received: from localhost (localhost [127.0.0.1])
>       by server (Postfix) with ESMTP id 4A7E8272C97
>       for <j...@localhost>; Fri, 16 Oct 2009 12:21:12 -0400 (EDT)
> X-Original-To: r...@localhost
> Delivered-To: r...@localhost.powercoreeng.com
> Received: from localhost [127.0.0.1]
>       by localhost with IMAP
> 
> 

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