Email Validation WordPress Plugin

Invalid email addresses in your WordPress forms cost you more than you think. The free ApiCheck email validation plugin for WordPress checks email addresses at the point of entry — so only valid addresses end up in your system.

What Does the Email Validation API Do?

The validation takes place in two steps:

1. Domain check — does the domain after the @ exist? (e.g. gmail.com, companyname.nl)
2. Mailbox check — does the mailbox before the @ exist? (e.g. jan.janssen, info, noreply)

If either check fails, the plugin shows an error message and the form cannot be submitted.

Benefits of Using Email Validation

• Less spam — bot forms often use fake email addresses
• Better deliverability — lower bounce rate = better sender reputation
• Cost savings — email marketing tools charge per contact; you pay for invalid contacts for nothing
• Clean data — every subscriber is a real, reachable email address

Why Email Validation in WordPress Is Crucial

WordPress forms are a popular target for spam and bot registrations. In addition to CAPTCHA protection, email validation is an effective second layer: even if a bot passes the CAPTCHA, a fake email address gets blocked.

Common mistakes the plugin catches:

• !gmail.con (typo in domain)
• @yaho.nl (missing letter)
• Disposable addresses from services like Mailinator or Guerrilla Mail

What Does the Email Validation WordPress Plugin Do?

The plugin integrates with popular WordPress form builders:

• Contact Form 7
• Gravity Forms
• Ninja Forms
• Elementor Forms

When a form is submitted, the plugin checks the email address in real time. The user sees a clear error message if their address is invalid.

Why Choose ApiCheck?

• Lightweight plugin — no impact on load time
• GDPR-compliant — no email addresses are stored on our side
• Free to start — 200 free credits when you create an account

Frequently Asked Questions

Which WordPress version is required? WordPress 5.0 or higher.

Does the plugin work with my theme? Yes, the plugin operates at form level and is completely theme-independent.

Is there a cost for the plugin? The plugin itself is free. You pay per validation through the ApiCheck credits system.