EmailVerify.NET - Simple e-mail validation code in C#
The following example verifies a single e-mail address, checking whether it points to a valid mailbox or not.
In the event it doesn't, a message is written to the console window.
var verifier = new EmailVerifier();
var status = verifier.Verify("address@example.org", VerificationLevel.Mailbox);
if (status.IsSuccess)
Console.WriteLine("Mailbox verification test succeeded!");