Kick spam with a highly advanced email validation in comment forms, user registration and contact forms using Mailgun's Email validation service.
WP Valid Email is a WordPress plugin which offers suggestions to users who mis-type their email address when entering it on your website.
Provides better email validations to protect your blog from spam comments and bots creating accounts.
This plugin validates the existence of the domain name that is entered in the email address while checkout for WP e-Commerce store owners.
Add a double email check field to Contact Form 7.