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129997 Add anti-spam logic to form

I have a simple form-to-email HTML form on my site. Spambots hit it constantly. I'd like to add challenge logic, such as presenting two single-digit random numbers and requiring the submitter to correctly enter their sum.

The form is used on the Blog City blog service, so it needs to work there.

HTML attached.

Kĩ năng: Bất kì công việc gì, Thiết kế trang web

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ID dự án: #1876165