So, on another forum I go on, my inbox became full. I received a notification somebody had tried to send me a message but couldn't, so I was a little bit disappointed I didn't get to see what they wanted to say. Then, after I'd cleared my inbox out a little, the message came into my inbox. So, basically, they had a system where the message would indeed send, but it wouldn't appear in your inbox until you'd deleted some messages. I'm not sure if that kind of thing could be implemented here, but I think it would be pretty neat.