The dirt on Web bugs
It's common practice. A message arrives in your inbox. You read it, realize that it may interest a friend, and pass it on accordingly. But be warned that simple, seemingly innocuous push of the forward button could be sending out more information than you think.
...The simplest of these tracking methods involves the inclusion of an image that is also linked to a Web server. When the email is opened, the recipient's computer looks up the image, and in so doing, sends information to the Web server. CSO | The dirt on Web bugs
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