Just as an update for this, there's a crazy rule on my server where internal mail goes to a different username than externally sent mail.
I'm very puzzled as to why this has stopped working, especially as it was working perfectly before.
I've pasted below the header of an email I sent just before this stopped working, any help would be very gratefully recieved:
Microsoft Mail Internet Headers Version 2.0
Received: from service8.mimecast.com ([212.2.3.136]) by server01.Enterprise.local with Microsoft SMTPSVC(6.0.3790.1830);
Fri, 27 Apr 2007 12:42:13 +0100
Received: from smtp01.bis.eu.blackberry.com (smtp01.bis.eu.blackberry.com [216.9.253.48])
by service8.mimecast.com;
Fri, 27 Apr 2007 12:42:13 +0100
Message-ID: <2023147474-1177674130-cardhu_blackberry.rim.net-8692256-@bxe008-cell00.bisx.produk.on.blackberry>
Reply-To:
References: <941950532-1177492055-cardhu_blackberry.rim.net-1111557458-@bxe035-cell00.bisx.produk.on.blackberry> <BFFB4AD7B6FE6542A5FC945F470EEEE5022B16C0@EVS.uk.c ommonpurpose.org.uk>
In-Reply-To: <BFFB4AD7B6FE6542A5FC945F470EEEE5022B16C0@EVS.uk.c ommonpurpose.org.uk>
To: "Simon Delf" <Simon.Delf@commonpurpose.org.uk>
Subject: Re: Message
From: "=?UTF-8?B?T2xpIFdhdHRz?=" <oli@enterpriseinsight.co.uk>
Date: Fri, 27 Apr 2007 11:42:35 +0000
MIME-Version: 1.0
X-MC-Unique: 107042712421301101
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: base64
Return-Path:
X-OriginalArrivalTime: 27 Apr 2007 11:42:13.0362 (UTC) FILETIME=[190BD520:01C788C1]