Attachment size limits and how to set them in Exchange 2007

I have a user that is trying to send a 17MB attachment and its kicking back. Now we have a mixed environment and the sender is on 2003 but the recipient is on 2007. I checked the Global limits and its more than enough. The 2007 environment inherited the Global limits from the 2003 and the Get-TransportConfig command confirms that.

I then started looking at the Receive Connctors on the two Hub Transport servers we have. Ah ha! The default is 10 MB so I changed them to 20MB. Still fails. I then started looking directly at the servers because I guess you can set limits on the Hub Transport servers. I used the command get-hubtransportserver "server name" | fl.
There are a lot of settings in there but which one pertains to message attachment size limits. I found something called  InternalDsnMaxMessageAttachSize and its set to 10MB by default, but I wasn't sure if I should change it. Can someone help out with this?
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osiexchangeAuthor Commented:
OK, I think I need more help than this. Exchange 2007 is now ok. I can send a 17MB attachment to myself  and my mailbox is on 2007. so everthing is ok on the Exchange 2007 side. My problem is users on the older 2003 environment trying to send to Exchange 2007 mailboxes is where it fails. I have checked everything. Global limits, RGC limits (no limit), SMTP Virtual server limits (none) and mailbox limits (none). Below is the bounce back the Exchange 2003 sender receives.

This message is larger than the current system limit or the recipient's mailbox is full.  Create a shorter message body or remove attachments and try sending it again.
            <  #5.2.3 smtp;450 5.2.3 Msg Size greater than allowed by Remote Host>
 What in 2003 can be blocking this message?
osiexchangeAuthor Commented:
One more thing. I can also send myself the 17MB attachment on the 2003 side so that side is ok. Its just going in between 2003 and 2007. RGC? No, I checked it already. Its unlimited.
osiexchangeAuthor Commented:
I think I figured it out. I modified the size limit on the Receive Connector I set up on the Exchange 2007 Hub Transport for Internal Relaying. I have a lot of servers with applications that relay off of Exchange 2007 Hub Transport servers and the size limit on that Connector was still 10MB. When I bumped that one up, the message went through. Apparently, when Exchange 2003 is sending to Exchange 2007, the Default Receive Connector was not being used. Instead, the Recieve Connector for relaying I created was being used. Make sense? I don't know but I think that fixed it.
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