
How to stop spammers registering my WP site?
I have several WP sites. One of them recently got attention from spammers (or it was included in some kind of submitter - probably sold here

I've been receiving about 50 registrations per day from several ips / domains / email addresses.
I already installed Ban Hammer and a couple other plugins that help to stop this. The best results came from Sabre plugin.
Registration page has graphical captcha, mathematic random field (3 * 15 per example) and Text Captcha (user is asked to type the nth letter of a random word).
It help but it didn't solve issue. Even with this kind of barriers some spammers pass the wall...
Right now all registrations must be confirmed by me before user is allowed to insert content. However user database is getting huge and spending time everyday cleaning it up is not nice

Moreover I'm affraid spammers find my other WP sites (and that should be a big issue)
Any ideas?
Thanks,
Antonio
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