I have made application that send a mail in group of 1000 people. In the mail i have put one link to "like" my product.
whenever user click on that link, my mail should return his/her email id in back and redirect to success page.
now my question is How to retrieve email address of that user out of 1000 email.
-thanks
You can't.
No email client will run JavaScript embedded in an email. For that matter, there are quite a lot that don't even support forms.
If you want to collect data from people you send emails to, and you want to know which user it is, then include a link in the email to a form on your webserver. You can pass the email address (or some other identifier) in the query string and use that to pre-populate the form.
Beware the possibility of recipients forwarding the email to other people. They'll forward the link their their identifying token.