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Mailster reCaptcha

v2.0.2 · by EverPress

Protect Mailster newsletter signup forms from spam with Google reCAPTCHA v3.

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About this plugin

Mailster reCaptcha adds Google reCAPTCHA spam protection to Mailster newsletter subscription forms. It uses reCAPTCHA v3, so visitors get a low-friction check instead of a checkbox challenge, while failed verifications are blocked on the server before a signup is accepted.

Use it when bot signups, fake subscribers, or newsletter form spam are polluting your Mailster lists.

This plugin requires Mailster 4.0 or newer and free Google reCAPTCHA site and secret keys. Form submissions send a reCAPTCHA response token to Google for verification.

Why use Google reCAPTCHA with Mailster?

  • Stop newsletter signup spam — Verify each protected form submission with Google before Mailster accepts the subscriber.
  • reCAPTCHA v3 — Invisible, score-based protection that runs in the background without a “I’m not a robot” checkbox.
  • Mailster block forms and legacy forms — Enable captcha per block form in the form editor, or select legacy forms under Newsletter settings.
  • Server-side verification — Tokens are checked with Google’s siteverify API so clients cannot skip the captcha by removing fields.
  • Custom error message — Show clear feedback when verification fails.
  • Optional skip for logged-in users — Disable reCAPTCHA for users who are already signed in to WordPress.
  • Loads only when needed — The reCAPTCHA script is enqueued for forms that have captcha enabled, including multiple forms on one page.

How it works

  1. Install and activate Mailster reCaptcha alongside Mailster.
  2. Create reCAPTCHA v3 keys in the Google reCAPTCHA admin console.
  3. Enter your Site Key and Secret Key under Newsletter Settings reCaptcha.
  4. Enable captcha on the forms you want to protect (legacy form checkboxes in settings, or the Enable reCaptcha panel on each block form).
  5. On submit, the plugin sends the token to Google and rejects the signup if verification fails.

Prefer a non-Google captcha? You may also try Mailster Cool Captcha for Forms. Addon overview: Use reCaptcha with Mailster.

Additional Info

This plugin requires the Mailster Newsletter Plugin for WordPress 4.0 or newer and Google reCAPTCHA site and secret keys. Protected form submissions are verified via Google’s reCAPTCHA API.

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