An Inbox System

So lately I've been getting kind of frustrated, when I need to talk/chat to people and they aren't online...

I know people are gonna say "Just message them on Skype" but, what if you don't want to give out your Skype to everyone just to keep in contact with them?

Implement an Inbox System.

I think this would be a great idea, in case you needed to message someone who is offline on your friends list about something important, Instead of hoping to be on at the same time.

Of course there could be some settings like turning off private messaging, or setting it to only have specific players message you, and so that people don't get spammed with messages from random people, they can set/toggle so that they can't get messages from people that aren't on their friends list.

There are many things that can be tweaked/changed with the inbox system, this is just an idea.

So instead of waiting to be online with a friend at the same time, you can just drop a message into their inbox and that person can respond whenever they like. I just think this would be a good idea for people who need to keep in contact with each other in case they play at different times, etc.

Feedback?