I don't think UlfStein is a spammer actually.
Since when do spammers take the time to play a nice game of OP2?
Well either ULFsteins account has been hijacked, or he is a spammer considering the PM I and others have received. Giving a link to a known spam/attack site.
If his account has indeed been hijacked then ULFstein is free to make a new account and choose a more secure password or if using a kiosk to properly logout and clear all board cookies.
So AmIMeYet, I take it that you have played a game of op2 with him/her?
If he/she passes email validation and you will vouch for himthen I'll reactivate the account.
EDIT:
Talked to ULFstein on IRC, a real person.