Double opt-in is a way to stop human spammers.

Email verification can be a barrier to users subscription. If they sign up with a fake email, it mostly just hurts them (they won't receive updates or password reset emails). Other rate limiting and abuse detection for multiple signups can be developed.

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How can I protect myself from Bad Bot (Spambot, Attacker )?

Bad Bots are robots with bad intentions. They are also known as attackers. They walk through: web pages trying to find a form and to fill them trying: to send email in mass to create a fake...

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