These banner ad companies typically "hide" the recipient's e-mail address in the Web address of the graphic, so that their servers can later match the cookie to the recipient's e-mail address, Smith said.
He used an e-mail address and Web site that were untraceable.
Entries submitted by any other individual or any entity originating at any other Internet web site or e-mail address, including but not limited to commercial sweepstakes subscription notification or entering service sites, will be declared invalid and, as such, ruled ineligible for this promotion.
It can also provide likely e-mail address, phone numbers and personal Web sites--and then use this information to add a new layers to the investigation.
The move follows the creation of a spoof e-mail address for Mr Blair which was set up by a web-logger who then began forwarding the hundreds of emails he received for the Prime Minister to Downing Street.
Amazon also removed an e-mail address included in a reader's review, which let Web surfers contact the reviewer directly.
You get an e-mail address from Posterous that you use to send attachments, text or Web clippings and up it goes on your Posterous blog.
Intermark WebSnake: Formerly called Anawave WebSnake, this utility supports offline browsing, Web-site mirroring (including directory structures), e-mail address retrieval, site maps, and advanced file searches.
Running on the software giant's Windows CE operating system, a stripped-down version of its desktop software, the devices will offer a calendar, address book, memo pad, voice recorder, e-mail and limited web browsing.
"When you go to a Web site they will not only know your cookie, but also your e-mail address, " Smith said.
Google believes users own information such as their e-mail address books, and should be able to take it with them wherever they go on the web.
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