Having spent most of the day reading and pulling my hair out, my eyes are now square and everything is slightly fuzz....I am desperately in need of a beer and some sleep

Problem - as ever - sorting mail. I am trying to replace a NT 4 server c/w exchange (for only 5 or 6 users -a bit of overkill if ever I saw it).
I have E V5.0.3 installed. Local domain is localnet. Server is esmith.localnet
The mail provider is a UK company called Netbenefit (not my choice) and all mail gets mapped to a single POP3 box.
The 'internet' domain is impamark.co.uk so mail gets to user@impamark.co.uk
Usual saga with mail all ending in the admin mail box.
I have dabbled with linux for a few years and have installed a few Esmiths before without any great hardship. Usually just as servers, but the last one runs multi pop quite happily.
I would be grateful if someone could examine the following and explain in words of one syllable why the multidrop sorting can't match anne@impamark.co.cuk (which it detects) with a user called anne and how to fix same problem. I have read all I can on the BB, tried Stephens excellent add-ons - user manager etc. and all to no avail.
I have set the email retrieval with originally the default sort, and then tried to specify with the line :
X-Mailmap-To:
Results as per last line below.
Any ideas ? Cos I'm right out of them. Mail seems to fly into the admin box with a singlemindedness that defies the imagination.
Have I got to get in and hack the .procmailrc per user ? I have one user with this using procmail rules as per Stephens add on but it fails too. No idea why.
All comments gratefully appreciated.
John Crisp
Return-Path:
Delivered-To: postmaster@esmith.localnet
Received: (qmail 7499 invoked by alias); 10 Feb 2002 22:15:11 -0000
Delivered-To: alias-localdelivery-postmaster@localnet
Received: (qmail 7496 invoked by uid
; 10 Feb 2002 22:15:11 -0000
Received: from localhost (127.0.0.1)
by localhost with SMTP id smtpdQiIjpZ; Sun, 10 Feb 2002 17:15:05 EST
Received: from mailhost.impamark.co.uk
by localhost with POP3 (fetchmail-5.7.4)
for postmaster@localnet (multi-drop); Sun, 10 Feb 2002 22:15:05 +0000 (GMT)
Received: from coumxnb02.netbenefit.co.uk ([212.53.64.125])
by mailhost.netbenefit.co.uk with esmtp (NetBenefit 1.5)
id 16a2Cj-0005GQ-00
for mbox11874a@pop.netbenefit.co.uk; Sun, 10 Feb 2002 22:12:13 +0000
Received: from [64.4.21.190] (helo=hotmail.com)
by coumxnb02.netbenefit.co.uk with esmtp (NetBenefit 1.7)
id 16a2Cj-0000JB-00 ; Sun, 10 Feb 2002 22:12:13 +0000
Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC;
Sun, 10 Feb 2002 14:12:12 -0800
Received: from 158.152.91.145 by lw14fd.law14.hotmail.msn.com with HTTP;
Sun, 10 Feb 2002 22:12:12 GMT
X-Originating-IP: [158.152.91.145]
From: "John Crisp"
To: anne@impamark.co.uk
Cc: lynne@impamark.co.uk
Bcc:
Subject: Test X-MAildrop
Date: Sun, 10 Feb 2002 22:12:12 +0000
Mime-Version: 1.0
Content-Type: text/plain; format=flowed
Message-ID:
X-OriginalArrivalTime: 10 Feb 2002 22:12:12.0801 (UTC) FILETIME=[FD93FF10:01C1B27F]
X-Mailmap-To: anne@impamark.co.uk
X-Fetchmail-Warning: recipient address anne@impamark.co.uk didn't match any local name
Also get :
X-Mailmap-To: anne@impamark.co.uk
X-Fetchmail-Warning: no recipient addresses matched declared local names