Reject Contact Form 7 Submissions Sent Too Fast
Stamps each Contact Form 7 form with a signed time when it is shown and treats submissions sent within a few seconds as spam. People take longer than bots to fill in a form.
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Reject Gravity Forms Submitted Too Quickly
Adds a signed time stamp to each Gravity Forms form and marks entries sent within a few seconds of the page loading as spam, which catches bots that fill forms instantly.