Dear all,

I am having a strange behaviour with the Reply-to field of a mailing list I
manage. The problem occurs when mail to the list is sent through an aliased
domain. The The list is hosted by an isp and managed through the listserv
web management interface. The 'actual' list name is
[log in to unmask] but a domain listserv.cacheweb.org has a DNS
pointer to the same IP address as the whathelps domain. The list Reply-to
header is set to Sender, Ignore. The list works as expected when the To:
field is [log in to unmask] as below

Return-Path: <[log in to unmask]>
Received: from lsmtp.whathelps.com ([64.49.220.162]) by
          ldap.dmc.dit.ie (Netscape Messaging Server 4.15) with ESMTP id
          HMSYA800.T3X; Wed, 15 Oct 2003 15:15:44 +0100
Received: from server161 (localhost) by lsmtp.whathelps.com (LSMTP for
Windows NT v1.1b) with SMTP id <[log in to unmask]>; Wed, 15 Oct
2003 9:18:13 -0500
Received: from LISTS.WHATHELPS.COM by LISTS.WHATHELPS.COM (LISTSERV-TCP/IP
          release 1.8e) with spool id 381527 for [log in to unmask];
          Wed, 15 Oct 2003 09:18:13 -0500
Received: from ldap.dmc.dit.ie by lsmtp.whathelps.com (LSMTP for Windows NT
          v1.1b) with SMTP id <[log in to unmask]>; Wed, 15 Oct
          2003 9:18:12 -0500
Received: from bigfoot.com ([147.252.71.103]) by ldap.dmc.dit.ie (Netscape
          Messaging Server 4.15) with ESMTP id HMSY9Q00.73N for
          <[log in to unmask]>; Wed, 15 Oct 2003 15:15:26 +0100
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0.2)
            Gecko/20021120 Netscape/7.01
X-Accept-Language: en-us, en
MIME-Version: 1.0
References: <p05200f1aba9cd85e1556@[10.0.3.20]> <[log in to unmask]>
            <[log in to unmask]>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
Message-ID: <[log in to unmask]>
Date: Wed, 15 Oct 2003 15:13:30 +0100
Reply-To: Eoin Kilfeather <[log in to unmask]>
Sender: Cache-All <[log in to unmask]>
From: Eoin Kilfeather <[log in to unmask]>
Subject: test
To: [log in to unmask]
Precedence: list

!However if the [log in to unmask] address is used the mail is
sucessfully distributed but the Reply-to header is not correctly set but
rather the lists.whathelps.com domain is transposed into the Sender and
Reply-to fields. This does not appear to be a problem with the mail client
or my local MTA as I have sent identical e-mails but with different domains
(please see headers below)

eturn-Path: <[log in to unmask]>
Received: from lsmtp.whathelps.com ([64.49.220.162]) by
          ldap.dmc.dit.ie (Netscape Messaging Server 4.15) with ESMTP id
          HMSYD000.Q3C; Wed, 15 Oct 2003 15:17:24 +0100
Received: from Server1186 (10.202.15.69:1315) by lsmtp.whathelps.com (LSMTP
for Windows NT v1.1b) with SMTP id <[log in to unmask]>; Wed, 15
Oct 2003 9:19:53 -0500
Received: from LISTS.WHATHELPS.COM by LISTS.WHATHELPS.COM (LISTSERV-TCP/IP
          release 1.8e) with spool id 119757 for [log in to unmask];
          Wed, 15 Oct 2003 09:23:14 -0500
Received: from 147.252.71.29 by LISTS.WHATHELPS.COM (SMTPL release 1.0f) with
          TCP; Wed, 15 Oct 2003 09:23:13 -0500
Received: from bigfoot.com ([147.252.71.103]) by ldap.dmc.dit.ie (Netscape
          Messaging Server 4.15) with ESMTP id HMSYCO00.Q3B for
          <[log in to unmask]>; Wed, 15 Oct 2003 15:17:12 +0100
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0.2)
            Gecko/20021120 Netscape/7.01
X-Accept-Language: en-us, en
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
Message-ID: <[log in to unmask]>
Date: Wed, 15 Oct 2003 15:15:16 +0100
Reply-To: Cache-All <[log in to unmask]>
Sender: Cache-All <[log in to unmask]>
From: Eoin Kilfeather <[log in to unmask]>
Subject: test
To: [log in to unmask]
Precedence: list

Has anyone see this behaviour before and can anyone help? Thanks in advance.

Eoin Kilfeather