obtaining e-mail address from a mailed link

[a0fundido]

Hi,

I am making this news site, and I want to send the link via e-mail to the subscribers. Once they click the link they will be directed to the startpage, where I want their e-mail address to be recognized by the page (as a simple way of authorization, without molesting the subscriber). Something like the referrers e-mail address.
Is there a way to do that, just sending the same link to everyone? Without placing any ID in the link.

I have been trying with parse_url and HTTP_REFERER but that doesn’t work.
Thanks in advance.

[Houdini]

Unless you have that user as a registered member of your site with their e-mail entered in a database or maybe a flat file there is no way to get their email address unless it is asked for, so you will have to have it saved somewhere and run a query on that user to get it.