Email becomes unreadible after going through Cisco email gateway
I have an issue with one sender who is trying to email password protected attachments to other staff in our organization.
The issue seems to only occur when the email goes through our C370, if he sends to an externally hosted email account the email and attachment can be opened, and when that email is then sent as an attachment back into our organization it is also openable, which seems to rule out our clients.
Sanitized header from the C370 below is part of the message header which I think might contain the problem, I have removed the first part with to & from as I didn't know if it was relevant..
Below is the header when a copy is sent to Hotmail:
x-store-info: J++/JTCzmObr++wNraA4Pa4f5Xd6uensydyekesGC2M= Authentication-Results: domain.com; spf=none (sender IP is IP Address) smtp.mailfrom=Sender@domain.uk; dkim=none header.d=domain.uk; x-hmca=none header.id=Sender@Domain.uk X-SID-PRA: Sender@domain.uk X-AUTH-Result: NONE X-SID-Result: NONE X-Message-Status: n:n X-Message-Delivery: Vj0xLjE7dXM9MDtsPTE7YT0xO0Q9MTtHRD0xO1NDTD0w X-Message-Info: NhFq/7gR1vQRHV6jbdvQfj78RRbHIsgK1hLH/9kB6NkUdTKzM/S60sw6uhmZk31ye2Ut7SsNRG194mNbBlVxpVFTOFvWOorYIP5ew8iIWHabwOUS2au4siXFpV/hL6TnYc2aLcBqOdiwZaz+fO5BeYoeCs9RYcubk1Jzn4Ff1TWTeX5PBOwirh+7vaICe5u9/LltrbQ5ODA+UL1EVPECVAszVGdCkiJ5 Received: from relayserver.uk ([220.127.116.11]) by SNT004-MC3F25.hotmail.com over TLS secured channel with Microsoft SMTPSVC(7.5.7601.22678); Tue, 17 Jun 2014 02:22:01 -0700 Received: from blah.net (blah.net [IP Address]) by IMSVA80 (Postfix) with ESMTP id D712D448A3A for <email@example.com>; Tue, 17 Jun 2014 10:21:59 +0100 (BST) Received: from Blah.local (smtp.server [IP Address]) by blah.net (Postfix) with ESMTP id 5F6B6448F33 for <firstname.lastname@example.org>; Tue, 17 Jun 2014 10:21:57 +0100 (BST) X-PMWin-Version: 18.104.22.168 X-MimeOLE: Produced By Microsoft MimeOLE V16.4.3528.331 Received: from blah.local ([192.168.46.221]) by Blah.blah.local with Microsoft SMTPSVC(IP address); Tue, 17 Jun 2014 10:21:36 +0100 Received: from Server name ([fe80:::::822d]) by Exchange server name ([192.168.46.221]) with mapi id 14.02.0342.003; Tue, 17 Jun 2014 10:21:36 +0100 From: "Surname, Firstname" <Sender@Domain.uk> To: <Recipiant@domain.com> Subject: Subject Thread-Topic: Subject thread-index: Ac+JToaXaax6VYP2Qlaj21mbCsrr5wAvrAhgAAASClA= Date: Tue, 17 Jun 2014 09:21:35 +0000 OLD-MSG-ID: <Old Message ID> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: X-Originating-IP: [192.168.30.85] Content-Type: multipart/mixed; boundary="----=_NextPart_000_0002_01CF8FA3.87849CD0" MIME-Version: 1.0 X-OriginalArrivalTime: 17 Jun 2014 09:21:36.0838 (UTC) FILETIME=[89D06E60:01CF8A0D] Message-ID: <Message ID> X-TM-AS-Product-Ver: IMSVA-22.214.171.1245-126.96.36.1997-20762.006 X-TM-AS-Result: No--42.282-60-31-10 X-imss-scan-details: No--42.282-60-31-10;No--42.282-3-31-10;No--42.282-4-31-10 X-TMASE-MatchedRID: JcGkxUY+Fi9XTuUjTP3HupObxJgN/hOxOhJ9m53n4aDIGC/aFIx4/sEhNzkwL19YZrHSGmcb0tPNR6N8PNUm3hQ3/xoDO/IlaK+MsTwM+1nP60q/FX5hsL40mI6UpXzvoYk2ByBT6IRl+EcAbF0M2///m9pcIDdz1kpuPUtox1KS2fL5IypDsYEcpMn6x9cZ67hywNgiYt0GLHHeUCuj17PllCNDDbY+2BJ2fZa5f2xqeX9tIrexd/jQkA7rdCuFfMhjt3b5PP1K0WT/zXAgkpjaylIY/e3Y9hU4NdzeECk8LuP+bOkMWt3jF2fVcPdzDB+ErBr0bANar2Wff4KSIaUXswX/xrISOe5BYzkyOSWATHNX4n1dGGZBslDPcF5vyAzYZQWW+9rbH8WaUL9qjLTxnpbCjruIowtRP8whCK8PmNN74zkTtDMO4HIvV/eCHcN4x+ltYL371rCnW2Nmh+V1K1TQIEH5D+WFNKXSJkRkYpwdTJ43fZUdXE/WGn0FVmA9rBozNAcLEpo317bQY8H9mYPMZJ+SW8KeTXPQ6zqOhzOa6g8KrXacDQD1LjGG8gyxx3MD7IZOuMJDRGZYWM2dM+bCCs0tT+iWcZL4Ksw= X-Hotmail-VirusCheck: Clean Return-Path: <Sender@Domain.uk>
The sender has advised they are using Outlook 2010.
Thanks in advance for any help working out why the email cant be read when coming in through our C370 gateway & sorry if posted in wrong community
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...