What is e-mail metadata? It is the information in the To and From fields as well as the IP addresses of the various servers that handle the e-mail from origin to recipient. It also includes the subject line, which can sometimes be very revealing as to the encrypted contents of the message. Metadata, a legacy from the early days of the Internet, is still included on every e-mail sent and received, but modern e-mail readers hide this information from display.6 PGP, no matter what “flavor” you use, does not encrypt the metadata—the To and From fields, the subject line, and the time-stamp
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