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Old 12-28-2005, 02:59 AM   #1
Registered: Dec 2004
Posts: 145

Rep: Reputation: 15
Postfix: why is 'Return-Path' of bounce message empty?

I found that in my postfix, the bounced mails that return to senders have 'Return-Path: <>', if the mails come from internet, this make the failures of "returning to sender", because:
"You are not authorized to send mail as <>"
"invalid user - <> SIZE=2509"

I'm not clear about the meaning of 'Return-Path', is there anyone can give me an explanation?

I explored the mailbox, and found:

From MAILER-DAEMON  Wed Dec 28 09:54:39 2005
Return-Path: <>
Received: by (Postfix)
        id 166EBF14086; Wed, 28 Dec 2005 09:54:39 +0800 (CST)
Date: Wed, 28 Dec 2005 09:54:39 +0800 (CST)
From: (Mail Delivery System)
Subject: Undelivered Mail Returned to Sender
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
Message-Id: <>

This is a MIME-encapsulated message.

This site has a valid DNS name. I don't know why it becomes user <> since there is "From: (Mail Delivery System)"?

Some mails were bounced by the remote server, and I found that the 'Return-Path' of the message which my server sent is right( Why?

Thank you.

Last edited by Chowroc; 12-28-2005 at 03:21 AM.
Old 12-28-2005, 04:52 AM   #2
Registered: Oct 2005
Distribution: Slackware
Posts: 228

Rep: Reputation: 40
I believe I've read that returned mail has a source address of <> (the null address) on purpose, to prevent mail delivery loops.


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