Alternatives to Mailster Kickbox

Check form email addresses with the ZBounce service. Requires purchased verification credits and an API key from zbounce.net.

ZeroBounce validates emails on your WordPress site in real-time, blocking invalid and risky emails to improve deliverability and reduce bounce rates.

Reliable WordPress email delivery with multiple providers, two connections, Return Path, Reply-To and visual AND/OR routing.

Block fake, disposable, and non-existent emails via SMTP verification. 5 free verifications/day, no signup needed.

Real-time email validation for registration, comments and forms via the Mail7 API. Blocks fake addresses - and never blocks one it cannot verify.

Block invalid emails like temporary, disposable, etc. with our real-time email verification. Verify email address during form-fill and stop form spam.

🚀 Transform Your Email Quality with Real-Time Validation Tired of fake emails, spam signups, and invalid customers? Unelma Email Verification with S …

The QuickEmailVerification email verification plugin to avoid fake, bad and nonexistent emails.

Validates email addresses in real-time and blocks form submissions with invalid or fake emails. Reduce spam, fix typos, and capture quality leads.

Stop fake, disposable, and invalid emails with real-time verification, 32 form integrations, bulk user scans, smart caching, and analytics.