Yup, mandatory email verification for registration combined with
captcha
- visual and sometimes audio confirmation combination of letters/ numbers generated randomly - will bring to a halt spammers... or at least greatly reduce the tide.
I have a problem with spammers spamming Easy Book (Joomla guestbook) and although it has an admin option to enable captcha, for the life of me I cannot get it to work. But I digress.
Cheers and a pox on spammers.