WordPress Email Check Plugins

All In One Form Verification by VerifyBee allows you to automatically verify your form submissions.

WP Valid Email is a WordPress plugin which offers suggestions to users who mis-type their email address when entering it on your website.

Validate an email address' structure, check MX-Records and check against known spoof/temporary email domains.

This plugin will send an email out to the administrator of the WordPress site to confirm and check if the server is able to send out an email