Teresa Harding
Teresa Harding voted up John Swindells' answer
You should discover which sites your email is registered with when you receive emails from them, which you inevitably will.  If you didn't sign up to a particular site yourself, you can insist that they remove your details from their system - the email they sent you will usually contain an 'unsubscribe' link, or you may … Read more
Teresa Harding
Teresa Harding voted up Ian John's answer
Currently, no web site exists where it is possible to discover a complete and accurate list of all sites that the address has been registered to. Indeed, many would view such a piece of software as potentially damaging as it could reveal private information as to the web habits of the person whose address it … Read more