> They do know what we are doing, but I am struggling to convince them that they need to solve it (the isp is British Telecom)
I'm not all that sure you'll be all that successful.
> Sending via mercury e doesnt work - see the post: 'Cant Get Mercury E to send'!
If you got a fixed IP address and registered host name then you could bypass the ISP assuming that they do not block port 25 outbound. They should never block port 25 (either inbound or outbound) on a system running a mail server.
> Is the way mercury behaves the norm for mail list servers? if so it
> gives me more ammunition.
It's the norm for all mailing list servers. The From: address is the original senders email address, the sender should be the mail servers email address. Here's the edited headers of a major mail server running LISTSERV.
Return-path: <owner-pmail@bama.ua.edu> <this is the original connecting MAIL FROM: address>
.
Date: Thu, 24 Sep 2009 09:37:48 +0100
Reply-To: Pegasus Mail for Windows Discussion List <PM-WIN@bama.ua.edu>,
Fred Bone <Fred.Bone@DIAL.PIPEX.COM>
Sender: Pegasus Mail Discussion List <PMAIL@bama.ua.edu>
From: Fred Bone <Fred.Bone@DIAL.PIPEX.COM>
Subject: Problem with References:
Comments: To: PM-WIN@bama.ua.edu
To: PMAIL@bama.ua.edu