Structure of an Email Message

1. Headers (lines of the form "field: value" which contain information about the message, such as "To:", "From:", "Date:", and "Message-ID:")
2. Body (the text of the message)

From johndoe@students.uiuc.edu  Mon Jul  5 23:46:19 1999
Received: (from johndoe@localhost)
        by students.uiuc.edu (8.9.3/8.9.3) id LAA05394;
        Mon, 5 Jul 1999 23:46:18 -0500
Received: from staff.uiuc.edu (staff.uiuc.edu [128.174.5.59])
        by students.uiuc.edu (8.9.3/8.9.3) id XAA24214;
        Mon, 5 Jul 1999 23:46:25 -0500
Date: Mon, 5 Jul 1999 23:46:18 -0500
From: John Doe <johndoe@students.uiuc.edu>
To: John Smith <jsmith@staff.uiuc.edu>
Message-Id: <199907052346.LAA05394@students.uiuc.edu>
Subject: This is a subject header.

This is the message body.  It is seperated from the headers by a blank
line.

The message body can span multiple lines.