Forum Banning Spammers...
 

In the last few days it seems my forum has been discovered by spammers! I've switched to ful moderation as a result which isn't ideal, yet spammers having had a couple of successes are now trying it on at least twice a day. People do have to register as a member before they can post, and I do have captcha turned on, though this seems to be no obstacle to them.

All the spam is being generated from email addresses on the old-drugstore.net domain, so is it possible to ban registrations from this domain only?