You can protect your Toolset forms from spam by adding a reCAPCTHA field to them.
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Toolset Forms supports Google reCAPTCHA (version 2). In order to use it, you must get API keys from Google. Once you have your API keys go to Toolset → Settings page and on Forms tab enter them into the reCAPTCHA API section.
Toolset Forms reCAPTCHA API settings
If you are creating a new form, the reCAPTCHA field will be automatically added to it. You can add a reCAPTCHA field to an existing form by drag-and-dropping it.
Form reCAPTCHA field
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