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8 | Chapter 1: Some Basics
A Received: line is added each time a machine receives the mail message. (If there are
too many suchlines, the mail message will bounce??”because it is probably in a
loop??”and will be returned to the sender as failed mail.) The indented line is a continuation
of the line above, the Received: line. The Date: line gives the date and time
when the message was originally sent. The From: line lists the email address and the
full name of the sender. The Message-ID: line is like a serial number in that it is guaranteed
to uniquely identify the mail message. And the To:* line shows a list of one or
more recipients. (Multiple recipients would be separated with commas.)
A complete list of all header lines that are of importance to sendmail is presented in
Chapter 25 on page 1120. The important concept here is that the header precedes,
and is separate from, the body in all mail messages.
1.5.3 The Body
The body of a mail message consists of everything following the first blank line to the
end of the file. When you sent your sendstuff file, it contained only a body. Now, edit
the file sendstuff and add a small header:
Subject: a test ?†? add
?†? add
This is a one-line message.
The Subject: header line is optional. The sendmail program passes it through as is.
Here, the Subject: line is followed by a blank line and then the message text, forming
a header and a body.
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