Sadly, like before I can send but nothing is received.
I think the issue is that I've had Picture Mail installed. Even once uninstalled, I don't get any notifications of Picture Mail/MMS at all. I think if I could find a way to go back to before I ever installed PM (when I got notifications of MMS) it might work. I just don't want to hard reset. Edit: Per below, maybe not. I dunno.