Check email addresses without actually sending an email. check MX records, smtp, syntax, mailbox ... With only one method call Email Validator.Net component will solve all your email validation problems. EmailValidator.Net is an essential component for email marketing list hygiene and to avoid ISP's mail servers blocking or barring your email domain because of you repeatedly sending emails to non-existing account holders. EmailValidator.NET is a powerful and reliable asp.net component. Simple to use, this component can be implemented for both Webform and Winform.