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?