UBB.threads PHP Forum Software Community Forums UBB.threads Version 7/8 Support How to deal with UBB7 private msg spammers?

A user registered and spammed hundreds of private messages to everyone on our board.

Is there a way to:

1. Delete all of their messages.

2. Put in place some sensible restrictions, such as X private messages/day, or something to prevent this from happening again?

Thanks