E-mail update for new worlds

I chose to liquidate my Stapelton airline to avoid distractions for a busy time IRL, and it looks like the server is full now.

I don’t really want to try and join an established server with no slots available, so it would be nice to get an e-mail when a new world was opening.

Also, a waiting list for full servers would be nice, in case other people leave Stapleton.