Spammers and trolls

Right, my forum has been attacked by a really persistent spammer (more accurately a "troll", but that's internet speak). I've noticed he/she's using a spam mail service called "mailinator" that changes his/her e-mail address every few minutes, allowing them to create massive amounts of accounts, which he/she then use to spam my forum. Is there a way to block registrations that use e-mails from certain providers (In this case, it has a few domains, primarily bobmail.com)? And if there isn't, it really should be added.

Thank you.

Edit: I forgot to mention he/she is using a proxy, so IP banning won't work.

I don't think there is something you can do about it but try this => A-CP => Users & Groups => Users >> Users options >> New accounts activation: by Admin and save.

See if that helps.

You could also try banning the bobmail.com addresses. Go to your Admin Panel>Advanced>Users & Groups>User>Ban Control>Users>Ban email address>type *@bobmail.com into the little window. Click Add.

Hopefully that will help to keep any emails using that address from registering. Repeat for other @xxxxx.com addresses using an * as a joker.

I suggest you to keep banning him and also ban his e-mail as the members suggested above, add more moderators if possible to keep the forum clean.