Cant send over a 3mb message in exchange 2007

Can't send any emails externally over 3MB any incoming or internal message do not have this problem the bounce message is;

__________________________________________________________________________

Delivery has failed to these recipients or distribution lists:

************************
This message exceeds the maximum message size allowed. Microsoft Exchange will not try to redeliver this message for you. Please make the message smaller -- by removing attachments, for example -- and try sending it again, or provide the following diagnostic text to your system administrator.

The following organization rejected your message: **********************

  _____  

Sent by Microsoft Exchange Server 2007

Diagnostic information for administrators:

Generating server: MATTRESSMANSVR.mattressmanltd.local

******************* #550 5.3.4 SMTPSEND.OverAdvertisedSize; message size exceeds fixed maximum size ##

Original message headers:

Received: from MATTRESSMANSVR.mattressmanltd.local
 ([fe80::4ef:f551:8c42:9fd9]) by MATTRESSMANSVR.mattressmanltd.local
 ([fe80::4ef:f551:8c42:9fd9%10]) with mapi; Tue, 31 Aug 2010 15:40:47 +0100
From: Paul Sparkes <************************>
To: "'************************'" <'**************************'>
Date: Tue, 31 Aug 2010 15:40:21 +0100
Subject: FW: test
Thread-Topic: test
Thread-Index: ActEN9BANZOEkkHaSvemvAF7K2zpiAAJd9EgACYAvbAAAZiycAAEVbVgAAEWCNAAAF7LQAAAFAGgAAAJ58AAABeIQAAHrFDgAAANtMAAAGqgkAAAJx8gAABGf/AAAT5lkAAAEIaAAAAXetAAIZtWUAAAIWngABAxfGAAAG5lwADBJsAwAAO5myAAAF/VAA==
Message-ID: <3B91353BAD951143A76551BD9045D5202590BD71B7@MATTRESSMANSVR.mattressmanltd.local>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
acceptlanguage: en-US
Content-Type: multipart/mixed;
      boundary="_006_3B91353BAD951143A76551BD9045D5202590BD71B7MATTRESSMANSV_"
MIME-Version: 1.0
____________________________________________________________

I have checked and double checked the following settings

Set-TransportConfig -MaxReceiveSize 40MB -MaxSendSize 40MB
Set-SendConnector “Connector Name” -MaxMessageSize 40mb
Set-ReceiveConnector “Connector Name” -MaxMessageSize 40mb
Set-ADSiteLink “SITE LINK NAME” -MaxMessageSize 40Mb

Using ADSIEdit > Select Configuration > Services > Microsoft Exchange > Your Org > Global Settings > Right click Message Delivery > Properties > Clear delivContLength and Clear submissionContLength
mattressman1Asked:
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Joel-LogicNetConnect With a Mentor Commented:
I would check to see if this limit is set in your firewall or router.  I know WatchGuard firewalls in particular have SMTP fixup settings that can affect deliverability in this way.  I would also consider any Antivirus or Antispam service that is running on the server.  Based on what you have already tried, I don't think Exchange is the issue here.
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uescompCommented:
You will have to adjust the settings on the exchange server properties, there is a size limit to messages sent which you can remove, on another note although you can have no maximum size limit your ISP typically does to and the standard is usually 10mb.

You can find some info here: http://articles.techrepublic.com.com/5100-10878_11-6165487.html

also here: http://www.msexchange.org/articles-tutorials/exchange-server-2007/management-administration/exchange-2007-message-size-limits.html
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mattressman1Author Commented:
Hello tried all the options in those links, also we have a 30Mb leased line so there is no caps there.
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mattressman1Author Commented:
erm I don't have any 3rd party antivirus or firewall on the server.

one thing I forgot to mention is this local server only forwards the messages onto a live web server we have running, I have tested sending large messages in and out of the live server with no problems. and the local server doesn't even open a connection to the live server when proccessing the emails

Ps the server was running for about 2 months from new sending messages of any size and it was only 2 weeks ago the problems started (I checked windows updates and there was no updates for at least 3 weeks before the problems started)
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uescompCommented:
So just to be sure you have adjusted the following settings

-Global Transport Settings
-Receive Connector Settings
-Send Connector Settings
-Mailbox Settings
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mattressman1Author Commented:
hello uescomp, yes I have checked and changed the figures in both the GDI and the Exchange Shell
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mattressman1Author Commented:
Found a rouge registry setting which fixed the problem in the end,
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