Truelist Email Validator connects your WordPress site to the Truelist email validation API. It checks every email address submitted through your forms before it enters your database — blocking invalid, disposable, and fake addresses at the point of entry.

Why validate emails?

Reduce bounce rates on your mailing lists
Keep your CRM and contact database clean
Stop disposable email signups (Mailinator, Guerrilla Mail, etc.)
Prevent fake registrations and comment spam

What gets validated

Invalid emails — addresses that don’t exist or have bad syntax
Disposable emails — temporary addresses from throwaway services
Role addresses — generic addresses like info@, admin@, support@
Failed MX check — domains with no valid mail server
Non-existent mailboxes — addresses where the mailbox doesn’t exist
Failed SMTP check — addresses rejected by the mail server
Bad syntax — addresses that don’t follow email formatting rules

Supported form plugins

Contact Form 7
Gravity Forms
WPForms
WordPress User Registration
WordPress Comments
Universal mode — catches email fields from any other form plugin automatically

Features

Real-time inline validation as visitors type (optional)
24-hour result caching — no redundant API calls
Fully configurable blocking rules — enable only what you need
Custom error messages
API key test button in settings
Fails open on API errors — your forms never break due to an outage

Requirements

A free or paid Truelist account is required. Sign up at truelist.io to get your API key.

External Services

This plugin connects to the Truelist email validation API to check whether email addresses are deliverable. This service is required for the plugin to function.

What data is sent: The email address submitted through your form is sent to the Truelist API for validation.

When it is sent: An API request is made each time a user submits a form with an email field. Results are cached for 24 hours — repeat submissions with the same address do not trigger a new API call.

Service provider: Truelist (https://truelist.io)