When you browse the Web, one of the pieces of information you are by default consenting to release about yourself is which web browser you use. As a standard part of the HTTP protocol, a string identifying your browser, its version, and its vendor is sent with every request for a web page. This information is public, as is the IP address of your Internet connection, for example. Other information, however, should not be public: this includes your email address, which should not be released unless you choose to do so by sending an email message or authorizing an automated email message to be sent under your name.
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