Search & Lookup Email IDs to Find Out Who is Emailing You

How to verify email address in ASP.Net using DNS lookup and verify ?

Hi,

I want to verify an email address much like in the solution presented here using ASP.Net/VB.Net Framework 2.0

http://bytes.com/forum/thread382836.html

If you can help, possibly with some valid code, please reply, full points will be awarded. Thanks
Thanks Colinc, I may need to reconsider my question. I just want to prove that an email address as provided is valid, beyond regex validation I mean

Using the verify regularly can get your own domain verified, and most organisations block the verify and similar requests now for security reasons, it has been used to mount DOS (denial of service) attacks on servers, and is used by criminals to randomly check for the existence of a user for spam purposes.