Re: BuddyPress Spam
I read your example. I need something with a wider net. First off, the robot registration never leave an e-mail address. Unlike WP comment spam, WPMU registration robots appear able to bypass required fields, including e-mail address.
I receive e-mails announcing new registrations that contain only IP addresses. Meaning I would need to include hundreds of IP addresses in your code.
The real solution is somehow create a bullet-proof required registration field or move the registration page behind a firewall. I’ve seen single-user WordPress installations that move the wp-admin or wp-signup pages to avoid robot attacks using the default name and location of these pages.
