Blocking manual form submissions by IP or domain [RESOLVED]

Does anyone in the community have first-hand suggestions to “silently” block/trash contact form submissions from certain IPs or domains? It seems a blacklist is our best option. Ideas/suggestions welcome.

Like many people, we receive too many manual solicitations offering their services. I have already looked at the 3rd-party plugins linked to from this site, some of which have not been updated in 10-12 months.

We do not want to:
Block submissions based on words used
Serve an error message stating they are blocked

Thank you in advance.

Hi Lance. This paid plugin is well supported and up to date:

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Thank you, Chris! I originally missed their point on IPs and thought they only blocked a negative list of words. I will look into them further.

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