How to know given email id is exists or not

HI,
I am sending email from my application after registration. if the user register with an email which is not existing, i need to find out. but how to know whether the given email id is exists or not.
when i am trying to send email to not existing emails id, it is not throwing any exception also.
can you please help me in resolving this
thanks in advance

Sampi-n wrote:
my requirement is like this.
when the user registers with his email id, it will mails him the password and first time it will automatically login(default login) to the application with out asking for username and password.
here i am sending mail to the given mail id. here i am not able to find the email was delivered or not. if i get to know that ican display registratin fails on the page with put default loginIt's best do it the way pbrockway2 suggested:
Or you could send some mail to the id containing a link which, when followed, completes the registration process. If the recipient doesn't mail back, have the registration fail. So you ask the user to enter his/her email id. Send an email with the verification link and/or key. Tell the user to check their email and either click the link or enter the registration key in some form. Once that is done, you mark their email address as verified and email them their username/password (personally, I dislike it when sites mail me my password. It's an insecure medium and there is no need for me to see my password when I've just registered, I just would like an option to reset it, that's all). Don't send a mail with the username/password before you've verified the account. What if the user misspelled the email id? The username/password could end up with someone else. And since most people use the same username and password everywhere, you'd be exposing their details to a stranger.

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