I just found an old friends plot in creative. I was wondering if there was a message thing that I could send to him when he's not one. That when when he does get on, he'll get it. If you could help that would be great.
If he has a forums account, you are able to create a conversation with him and he'll get it within 5 seconds, but he must be online on the forums to read it. If in-game, there is no way that I am aware of because Cyp/Crew disabled /mail. Try suggesting a way in the suggestions section. Good luck finding your friend.