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+.\" Copyright (c) 1980, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)mail7.nr	8.1 (Berkeley) 6/8/93
+.\"
+.sh 1 "Format of messages"
+.pp
+This section describes the format of messages.
+Messages begin with a
+.i from
+line, which consists of the word
+.q From
+followed by a user name, followed by anything, followed by
+a date in the format returned by the
+.i ctime
+library routine described in section 3 of the Unix Programmer's
+Manual.  A possible
+.i ctime
+format date is:
+.(l
+Tue Dec  1 10:58:23 1981
+.)l
+The
+.i ctime
+date may be optionally followed by a single space and a
+time zone indication, which
+should be three capital letters, such as PDT.
+.pp
+Following the
+.i from
+line are zero or more
+.i "header field"
+lines.
+Each header field line is of the form:
+.(l
+name: information
+.)l
+.i Name
+can be anything, but only certain header fields are recognized as
+having any meaning.  The recognized header fields are:
+.i article-id ,
+.i bcc ,
+.i cc ,
+.i from ,
+.i reply-to ,
+.i sender ,
+.i subject ,
+and
+.i to .
+Other header fields are also significant to other systems; see,
+for example, the current Arpanet message standard for much more
+information on this topic.
+A header field can be continued onto following lines by making the
+first character on the following line a space or tab character.
+.pp
+If any headers are present, they must be followed by a blank line.
+The part that follows is called the
+.i body
+of the message, and must be ASCII text, not containing null characters.
+Each line in the message body must be no longer than 512 characters and
+terminated with an ASCII newline character.
+If binary data must be passed through the mail system, it is suggested
+that this data be encoded in a system which encodes six bits into
+a printable character (i.e.: uuencode).
+For example, one could use the upper and lower case letters, the digits,
+and the characters comma and period to make up the 64 characters.
+Then, one can send a 16-bit binary number
+as three characters.  These characters should be packed into lines,
+preferably lines about 70 characters long as long lines are transmitted
+more efficiently.
+.pp
+The message delivery system always adds a blank line to the end of
+each message.  This blank line must not be deleted.
+.pp
+The UUCP message delivery system sometimes adds a blank line to
+the end of a message each time it is forwarded through a machine.
+.pp
+It should be noted that some network transport protocols enforce
+limits to the lengths of messages.