Reduce contact form spam

I get a number of contact form spam items each day. They have similar IP addresses as Cloudflare. (108.162., 162.158., 172.70.) Each IP address is different. How to I minimize or eliminate them without effecting valid contact form submissions?

If your server is recording Cloudflare’s IPs for visitors, on traffic that’s proxied through Cloudflare, you can restore their original IPs.

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