About this plugin
FixBounce Email Verifier checks if every email address on your site actually exists — not just if it looks valid, but if the mailbox is real. Install, activate, and you’re protected immediately. No account needed.
How It Works
Every email submitted on your site (registration, comment, contact form, checkout) is verified through the FixBounce API:
- Syntax check — Is the email properly formatted?
- Disposable domain check — Is it a throwaway address? (350+ domains blocked)
- MX record check — Does the domain have a mail server?
- SMTP mailbox verification — Does the actual mailbox exist?
- Catch-all detection — Does the domain accept any address?
- Deliverability score — Deliverable, Risky, or Undeliverable
All 6 checks run on every verification. The only difference between plans is how many verifications per day.
Plans
- Trial (no signup) — 5 verifications/day. All features. Install and go.
- Free account — 10 verifications/day. Create a free account at fixbounce.com and add your API key.
- Pro ($29/mo) — 500 verifications/day + bulk user verification.
What Gets Protected
- Registration — Blocks signups with fake or non-existent emails
- Comments — Stops comments from disposable or invalid addresses
- Contact forms — Real-time validation on Contact Form 7, WPForms, Gravity Forms, Elementor, Ninja Forms, and any HTML form
- WooCommerce — Verifies billing email before order is placed
When the daily limit is reached
Verification pauses until the next day. Forms, registrations, and comments work normally — they just skip the email check. A notice appears in the admin dashboard with upgrade options.
Privacy
Only the email address is sent to the FixBounce API for verification. No other user data is transmitted. See our privacy policy.