Buy E-Mail Validator - check and verify if an e-mail address exists and is valid by using the mailserver Software! - Version 9.0 Verify whether e-mail addresses are valid by contacting the mail server to see if it actually exists on the domain! This software is great to make sure your list of newsletters e-mail addresses is clean, and contains no fake addresses! Many people when they sign up for a newsletter enter a fake e-mail address, which then results in multiple bounces and possible (temporary) suspension of a domain.