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Check &nbsp;the message site limits for Global setting, Connector settings, SMTP virtual server setting, mailbox store, and User mailbox setting as outlined in the following links<br />
<a href="http://www.msexchange.org/tutorials/Set-Size-Limits-Messages.html" rel="ugc">http://www.msexchange.org/tutorials/Set-Size-Limits-Messages.html</a><br />
<a href="http://support.microsoft.com/kb/322679" rel="ugc nofollow">http://support.microsoft.com/kb/322679</a>
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Thank you for the quick response. I had all the message size limits set to at least 20Mb, in the global and connector settings and still no affect. So out of frustration I decided to just remove all message restrictions entirley on the global and the connector settings &amp;&nbsp;everyhthing started working. I can Now send a message thats greater than 10Mb. I put the size limits back to 100000Kb and it wouldn't send again. So I'm just taking off the resrtrictions entirely. Thanks microsoft. 
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Hello, <br />
I recently have come accross a serious issue where as the end user is trying to send large attachments usualy over 6Mb but Under 20Mb and the messeges sit in the outbox of his outlook 2007 client. I am running exchange 2003, and have checked and double checked all the settings to be correct. I have even gone as far as to set a maximum messege size limit to 100Mb, which I know is a bit extreme but I was trying anything possible, it was previously set to 20Mb. I am lost. If the messege is 5Mb it sends with no problem any larger the 6Mb it just sits in the outbox of every mail client on the network, all of which are outlook 2007 and are connected to the exchange server.
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Hello, 
I recently have come accross a serious issue where as the end user is trying to send large attachments usualy over 6Mb but Under 20Mb and the messeges sit in the outbox of his outlook 2007 client. I am running exchange 2003, and have checked and double checked all the settings to be correct. I have even gone as far as to set a maximum messege size limit to 100Mb, which I know is a bit extreme but I was trying anything possible, it was previously set to 20Mb. I am lost. If the messege is 5Mb it sends with no problem any larger the 6Mb it just sits in the outbox of every mail client on the network, all of which are outlook 2007 and are connected to the exchange server.

Email with large attachments sit in outbox outlook 2007 with exchange 2003

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.