Thread:Project:Support desk/spam users/reply (5)

You can also install BlockandNuke which I've had great success with and am working to improve.

It works by whitelisting "good" users. You could whitelist your current users and then use BlockandNuke as needed to block new spam accounts.

(It does require that you update a text file to whitelist users, so I should add a way to approve new accounts as non-spammers on-wiki.)