Whats this about “hidden” and “visible” portions of an email message?
The beginning of every email message contains several “headers”; for example, the From address is a header, as is the date the message was sent, the subject line, etc. Those headers are visible because they are more useful that way. However, there are other headers which most email programs don’t show unless you specifically tell them to. For instance, every server that a message passes through adds a “Received” header indicating where it got the message from and when it arrived there (unfortunately, these headers can also be faked.)There are other hidden headers such as a unique message ID, the program that created the email message, technical information on how to interpret attachments, and so forth. These headers are generally not shown by email programs.
