Jon Pauli wrote:

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 ;)

This is the message/rfc822 part attached to the bounce notification. T'bird will call it ForwardedMessage.eml if it can't find a Subject: in it which in this case, it can't because the message has no headers and no body.

I think this represents a null message sent to the listnam-bounces address, being detected as 'unrecognized' (not surprising) and forwarded to the owner.

2. An email where no subject and no sender appear in the MUA. The

headers are as follows:

Delivered-To: me@mydomain.com Return-Path: < mailman-bounces@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@mail.mydomain.com Errors-To: mailman-bounces@mail.mydomain.com Message-ID: courier.465EE260.00010B2E@mydomain Date: Thu, 31 May 2007 09:57:36 -0500 To: undisclosed-recipients: ;

This appears to be the result of a null message delivered to the listname-owner address with a few headers added by Mailman and the outgoing MTA.

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?

Your outgoing MTA thinks its 'localhost' is 192.168.10.22. Check the MTA configuration for any occurrence of 192.168.10.22.

2. The end of the Message-ID: line contains only mydomain, not say,

mydomain.com like non-mailman emails.

I think your MTA made up this message-id, so again, look to your MTA.

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".

This is really a T'bird question, but yes, what T'bird labels as 'sender' in the folder contents pane comes from the From: header.

It seems what is happening is for every incoming message to listname@example.com, a null (empty) message is also delivered to listname-bounces@example.com and listname-owner@example.com.

When you say "every time anyone- member or non-member posts", do non-member posts get held, rejected or discarded? If so, I think that says these extra null messages are created at incoming message time, probably from some mis-configuration of aliases or routers/transports in the incoming MTA.