After user registers, I send an email with a guid link to click to validate the registration.
It confirms the email exists, but how does that help fight spammers?
Can’t bots ‘click’ same link back to the site and validate registration just the same?
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You’re right, it doesn’t prevent spammers. All it does is create another obstacle for users trying to use your site/service/app. Is that something you really want? You should be removing obstacles, not creating them. It sounds like you’re solving a problem you don’t even know you’re going to have or not.