Resent Messages
   Start with the message that has been used as an example several
   times:
   ----
   From: John Doe <jdoe@machine.example>
   To: Mary Smith <mary@example.net>
   Subject: Saying Hello
   Date: Fri, 21 Nov 1997 09:55:06 -0600
   Message-ID: <1234@local.machine.example>
   This is a message just to say hello.
   So, "Hello".
   ----
   Say that Mary, upon receiving this message, wishes to send a copy of
   the message to Jane such that (a) the message would appear to have
   come straight from John; (b) if Jane replies to the message, the
   reply should go back to John; and (c) all of the original
   information, like the date the message was originally sent to Mary,
   the message identifier, and the original addressee, is preserved.  In
   this case, resent fields are prepended to the message:
Resnick                     Standards Track                    [Page 47]
RFC 5322
                Internet Message Format             October 2008
   ----
   Resent-From: Mary Smith <mary@example.net>
   Resent-To: Jane Brown <j-brown@other.example>
   Resent-Date: Mon, 24 Nov 1997 14:22:01 -0800
   Resent-Message-ID: <78910@example.net>
   From: John Doe <jdoe@machine.example>
   To: Mary Smith <mary@example.net>
   Subject: Saying Hello
   Date: Fri, 21 Nov 1997 09:55:06 -0600
   Message-ID: <1234@local.machine.example>
   This is a message just to say hello.
   So, "Hello".
   ----
   If Jane, in turn, wished to resend this message to another person,
   she would prepend her own set of resent header fields to the above
   and send that.  (Note that for brevity, trace fields are not shown