[Mailman-Users] odd empty bounce message generated upon posting to a mailing list

[Jon Pauli]

Hello,

I have been looking around in the docs and have not seen anything that
matches my issue.

I have a couple of mailing lists and every time anyone- member or
non-member posts, everything works fine but the list owner gets

1)An uncaught bounce notification containing an empty attachment
called ForwardedMessage.eml. Thunderbird is the MUA so I'm guessing it
is responsible for determining how to interpret the attachment, but
even if I save it as a text file it is a 2 byte long file with no
visible characters in it...I didn't take a hex editor to it. I
understand why listowner gets these, I'm just not sure how it can work
with a 2 byte file and no headers ;)

2. An email where no subject and no sender appear in the MUA. The
headers are as follows:

Delivered-To: me at mydomain.com
Return-Path: <
mailman-bounces at mail.mydomain.com>
Received: from [192.168.10.22] (softdnserr [127.0.0.1])
by mail.mydomain.com with esmtp; Thu, 31 May 2007 09:57:36 -0500id
00A9A0CA.465EE260.00010B2E
Sender: mailman-bounces at mail.mydomain.com
Errors-To: mailman-bounces at mail.mydomain.com
Message-ID: <courier.465EE260.00010B2E at mydomain>
Date: Thu, 31 May 2007 09:57:36 -0500
To: undisclosed-recipients: ;

The interesting things I noticed are:

1. The Received: header line is wrong. The mail server has a DNS
server running on it as well as the MTA.  its IP is 192.168.11.22 NOT
10.22 There is no 192.168.10.22 on my network. This happens only for
mailman emails. I don't recall having to set any IPs when I set up
mailman. What is wrong here?

2. The end of the Message-ID: line contains only mydomain, not say,
mydomain.com like non-mailman emails.

3. There is no Sender showing up in the MUA but the Sender: header is
present. It looks like Thunderbird maybe uses the From: header instead
of the Sender header despite naming the column where this would appear
"Sender".

I'd appreciate any thoughts or insight into this. I am confused.