ok peeps while back (prob 3-5 years lol) I remember reading an article about email addresses
and how you could tag an email to keep track of which website or places were sending them on to other companys etc

now say i registered my email with amazon and it was something like

mobileman @ 123email.com , now you actually registered the email as mobileman @ 123email.comamazon

this way when you registered an email to a new website/account etc you could see if and where its used by other firms

or something along those lines, anyone got any ideas ??