Pirat, you are a ubercritical idiot. A mailbox is a concept that has been in use by humans for hundreds of years
I do not think that you know how long mail boxes were in developement on Graal2001, Graal2002 and Gaia. As Stefan said, the mailboxes were in the mudlib, and the idea came up for Graal2001 even before that. So it is pretty obvious that not one person has invented the idea of Graalian mailbox while all others have stolen it.