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Every email message comes with some header lines that you normally do not see. These include lines added by the Internet mail transport system to record the route your message took for diagnostic purposes. These are normally of no import and simply add clutter, so Pine suppresses them from MESSAGE TEXT display.
There is, however, a way to reveal them. The header mode (H) command is a toggle which controls Pine's handling of these header lines. Normally, full headers is ``off'' and you only see a few lines about recipient(s) and sender(s) of a message. When you press H to turn full headers on, Pine will show you the normal header lines as well as delivery headers, comment headers and MIME headers.
Several different Pine commands honor the header mode, as it affects how messages are displayed, how they appear in forward and reply email, how they are saved and how they are exported.
The presence or absence of the header mode command is determined by the enable-full-header-cmd option in your Pine configuration.