Check Email Validity (Server-Side)

How do we Check Email Validity (Server-Side)

Can it be done directly thru .Net

If not is there any free component ?

Pls Suggest

If you mean check the syntax of the supposed email so it looks like an email, then yes.
Do google for "email syntax validation .net"

IF you mean check to see THE email entered actually exists in the world, yes and no. You can check the last part of the email (the domain name) by doing a dns lookup. But not many domains I know of return a list of valid email addresses at their domain, otherwise spam would be 100% worse.

So while you could check for [email protected], by verifying msn.com is a valid domain, you couldn't verify there is actually a Steve there.

I validate that the email given was correct by sending a random string in a query string in a link they can click to verify the address. If they don't respond, there email is never validated, so my assumption is they faked it or were not serious about signing up.

If you just want to make sure the structure is right, then use a regular expression you can find almost everywhere on the net as mentioned above.