Hey everyone. I need some help.

I'm having a problem sending MMS messages. I can receive them perfect. No issue whatsoever. However, sometimes when I send them, the person I'm sending it too will recieve a message with a "red x" where the pic should be. This happens most of the time, but not all the time. What could be the cause of this?

It seems odd that I can receive fine but not send them properly.


Oh and one more thing. I will try and send the pic to myself (the pic I'm trying to send at the time to someone else and who receives the red x) and it also works fine.