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I am building a contact form which calls a post controller and emails some of the posted values to a specified recipient.

My question Is How can I'secure' this form other than CAPTCHA? I looked at the Magento Contact form and that doesn't seem to have any mechanisms to stop someone simply calling the POST method and spamming the site.

Obviously I am checking/sanitizing inputs, but it seems like I should be at least incorporating a nonce or some kind of barrier.

Is there a 'best practice' in Magento?

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As far as I know, Magento uses form_key to preventing against Cross Site Request Forgery. So you should use that first before the CAPTCHA option.

Reference post: Magento 2 - What is the use of formkey

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