full-disclosure - Is the FBI using email Web bugs?

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From: geoincidents at getinfo.org (Geo.)
Subject: Is the FBI using email Web bugs?

http://www.nthelp.com/OEtest/oe.htm

it's all in how you code the link, email can be sent to thousands each with
a different link coding which points to the same website and you can confirm
which people read the email.

Geo.

-----Original Message-----
>>How can it tell web bugs from any other HTTP requests? The only thing
that makes a URL contain a web bug is that I only sent it to you.