From you@Here.US.EDU Fri Dec 13 08:11:44 1996 Received: (from you@localhost) by Here.US.EDU (8.8.4/8.8.4) id AA04599 for you; Fri, 13 Dec 96 08:11:44 -0700 Date: Fri, 13 Dec 96 08:11:43 From: you@Here.US.EDU (Your Full Name) Message-Id: <9631121611.AA02124@Here.US.EDU> To: you may be something else (see Section 34.8.43, NoRecipientAction )
Notice that most header lines start with a word followed
by a colon. Each word tells what kind of information the rest of
the line contains.
There are many types of header lines that can appear in a mail message.
Some are mandatory, some are optional, and some may appear
many times. Those that appeared in the message that you mailed
to yourself were all mandatory. That's why
added them to
The line starting with the five characters "
A complete list of all header lines that are of importance to sendmail is presented in Chapter 35, Headers . The important concept here is that the header precedes, and is separate from, the body in all mail messages.