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I was able to catch all spam comments by adding textfields for "title" and "body" hidden by CSS which would always be filled in anyway by bots but not humans.

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same here, only with "email" field. For CSS-less humans, it even had a label: "please leave this field blank" :D

You filter both bots AND people who can't follow directions!

You never can be too sure haha!

That was a solution that worked almost all the time. I remember doing the same with inputs for email too

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