bookem
04-09-2009, 08:38 PM
I know this may not be the best place to post this, but I've been trying to track this down all day and hopefully somebody here can help...
I've got an Exchange 2007 (Version 8.1 (Build 240.6)) installation as part SBS 2008 Premium. On a separate machine, I have an asterisk VOIP server handling my incoming faxes. Prior to making the switch to Exchange, the VOIP server was successfully receiving faxes and sending emails with PDF attachments, and since the move to Exchange the emails are coming through with no attachments. No configuration on the VOIP server has changed except for the SMTP relay server now being Exchange instead of our ISP.
Here is an example header before the move to Exchange (domain names changed to protect the innocent):
Received: by asterisk1 (sSMTP sendmail emulation); Wed, 08 Apr 2009 09:58:45 -0600
Date: Wed, 08 Apr 2009 09:58:45 -0600
From: HylaFAX Agent <fax>
To: [email protected]
Subject: Fax received from "EsyncMailfaxPlus"
Mime-Version: 1.0
Content-Type: Multipart/Mixed;Boundary="NextPart1605"
X-SCA-Stop: [B6A0F3C6EF4D431D877402DC88784B1A,7,16,0]
Message-Id: <[email protected]>
Envelope-To: [email protected]
Here is the header after the move:
Received: by asterisk1 (sSMTP sendmail emulation); Thu, 09 Apr 2009
17:08:54 -0600
Date: Thu, 9 Apr 2009 17:08:54 -0600
From: HylaFAX Agent <fax>
To: FaxMaster
Subject: Fax received from "Fax Sender"
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: Quoted-Printable
Message-ID: <[email protected]>
Return-Path: [email protected]
X-MS-Exchange-Organization-Antispam-Report: IPOnAllowList
X-MS-Exchange-Organization-SCL: -1
X-Auto-Response-Suppress: DR, OOF, AutoReply
A couple notes on the configuration:
-Because the VOIP server is sending anonymously, I've added it's IP to the range specified in the "Internet Receive" connector rather than add "Anonymous Users" to my Default receive connector.
-The VOIP server's IP is on the Anti-Spam IP Allow List
-The recipient [email protected] is a distribution group that does not require that all senders are authenticated
My guess is that Exchange has decided to fudge the content-type header and thus removes the PDF attachment, but I have no idea why. Here's what I've tried so far to fix the problem:
-Created a transport rule to change the content-type header back to multipart/mixed: No Success
-Set the "Exchange rich-test format" option to "Never use" for all Remote Domains: No Success
-Changed my Content Filtering SCL threshold for rejecting messages to 8 instead of the default 7: No Success
What am I missing? Is there any way to actually see what Exchange is doing to my message?
Thanks,
Dan
I've got an Exchange 2007 (Version 8.1 (Build 240.6)) installation as part SBS 2008 Premium. On a separate machine, I have an asterisk VOIP server handling my incoming faxes. Prior to making the switch to Exchange, the VOIP server was successfully receiving faxes and sending emails with PDF attachments, and since the move to Exchange the emails are coming through with no attachments. No configuration on the VOIP server has changed except for the SMTP relay server now being Exchange instead of our ISP.
Here is an example header before the move to Exchange (domain names changed to protect the innocent):
Received: by asterisk1 (sSMTP sendmail emulation); Wed, 08 Apr 2009 09:58:45 -0600
Date: Wed, 08 Apr 2009 09:58:45 -0600
From: HylaFAX Agent <fax>
To: [email protected]
Subject: Fax received from "EsyncMailfaxPlus"
Mime-Version: 1.0
Content-Type: Multipart/Mixed;Boundary="NextPart1605"
X-SCA-Stop: [B6A0F3C6EF4D431D877402DC88784B1A,7,16,0]
Message-Id: <[email protected]>
Envelope-To: [email protected]
Here is the header after the move:
Received: by asterisk1 (sSMTP sendmail emulation); Thu, 09 Apr 2009
17:08:54 -0600
Date: Thu, 9 Apr 2009 17:08:54 -0600
From: HylaFAX Agent <fax>
To: FaxMaster
Subject: Fax received from "Fax Sender"
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: Quoted-Printable
Message-ID: <[email protected]>
Return-Path: [email protected]
X-MS-Exchange-Organization-Antispam-Report: IPOnAllowList
X-MS-Exchange-Organization-SCL: -1
X-Auto-Response-Suppress: DR, OOF, AutoReply
A couple notes on the configuration:
-Because the VOIP server is sending anonymously, I've added it's IP to the range specified in the "Internet Receive" connector rather than add "Anonymous Users" to my Default receive connector.
-The VOIP server's IP is on the Anti-Spam IP Allow List
-The recipient [email protected] is a distribution group that does not require that all senders are authenticated
My guess is that Exchange has decided to fudge the content-type header and thus removes the PDF attachment, but I have no idea why. Here's what I've tried so far to fix the problem:
-Created a transport rule to change the content-type header back to multipart/mixed: No Success
-Set the "Exchange rich-test format" option to "Never use" for all Remote Domains: No Success
-Changed my Content Filtering SCL threshold for rejecting messages to 8 instead of the default 7: No Success
What am I missing? Is there any way to actually see what Exchange is doing to my message?
Thanks,
Dan