One thing I might add with regard to a Captcha, is that it's not foolproof. As I have a site that suffers from Spam contact form submissions, even though there is a Captcha.

It is a never ending problem, and is the bain of my life at times. I get their i.p address submitted to me via the form, and block their access, as soon as I find out that there is an attack. Sometimes, I get hundreds before I can block 'em.

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