- Block disposable email addresses (internal list and check against undisposable.net).
- Block domains and/or subdomains.
- Block usernames.
- Block IPs or IP ranges.
- Block bots by checking against BotScout database.
- Perform DNS lookup on email domains.
- Reject contact submissions containing URLs.
- Reject contact submissions based on Undisposable, BotScout, StopForumSpam.

Works with Community Builder 1.2.
Works with Virtuemart.
Works with CBE.
Works with AjaxRegistration.

If the email address passes the internal check, it is still checked against undisposable.net. Registration is allowed if either undisposable.net is unavailable (which seems to be constantly, at the moment) or the address does not come back as invalid.