I got mine to work after fighting the send / no receive issue that we all have been frustrated with.
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UPDATE!!!!!!
For those still having problems with MMS messages, I have the fix...
For US T-Mobile customers, go to the T-Mo wireless data configurator site:
http://tmobileus.wdsglobal.com/phonefirst
Select video/picture messaging
select Motorola as the make of phone
Select Rokr E1 as the model
Enter your number... then make a note of the PIN for when the message arrives.
Enter the PIN in the message, and let it install the update.
Once its done, go to your messages main screen and tap the Menu icon in the bottom left corner.
Select Service Setup > Multimedia Message
At the top of the window that opens, click the + at the Default Profile and select Picture Messaging then Menu > Edit
At the bottom of the window, be sure the Network Profile is also Picture Messaging.
Save, and then set Picture Messaging as Default, then Save again.
The problem was that when you manually set up your MMS, you automatically set it up to use your websession as the Network Profile. Picture messaging uses its own IP address. Manually setting that up, we would miss that.
[INFO] T-Mobile MMS settings UPDATE 
THANK YOU!!!!!!!!!!!!!!!!!!!!! 
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