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This fairly new PHP class has an Ajax based interface and is used for AntiSpam Feedback forms.

The class can be used to validate the e-mail address that users enter in your feedback form before accepting the submission. It makes things a little more tedious for uses as it sends an e-mail to the user submitting the form with a special code in a link. Basically, it requires your user to validate their e-mail address before letting the form data be sent.

A small problem I see is that if the user doesn’t validate their e-mail within 1 day, the info is deleted. It’s not a route I would personally take, however if you are getting bombarded by spam coming from your form it may be for you.

Here’s an extra tip… If you are getting bombarded by spam coming from your form you better check to be sure that your form is secure and not allowing someone to hijack it to send spam from your domain. Your host wouldn’t be very happy about that!