I FIGURED IT OUT!!!
I just did a vx9800 V, which has the same MMS configuration settings as the vx8550.
The settings are as follows:
Server Name:
[You must be registered and logged in to see this link.]MMS UAProf URL in User Agent: /servlets/mms
MMS Sending From Field Type: MDN Only
MMSC Servder Post URL:
[You must be registered and logged in to see this link.]MMSC Server Post CGI: ?message-id= (leave this as the default settings)
I used the vx9800 .DLL file.