That's not really a protocol level solution. Sure, it works, if you know how to do it - but you don't automatically gain that knowledge "out of the box", you ha

That's not really a protocol level solution. Sure, it works, if you know how to do it - but you don't automatically gain that knowledge "out of the box", you have to learn it. It is a real problem to anyone trying it out that doesn't understand why they can't send a message to someone who is offline.