From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Tue, 11 Nov 1997 01:44:14 -0500
From: Scott Schwartz schwartz@finch.cse.psu.edu
Subject: [9fans] A patch for ftp.c
Topicbox-Message-UUID: 6b52cf38-eac8-11e9-9e20-41e7f4b1d025
Message-ID: <19971111064414.VD--H1JJLwXcR7_puazYIj-qmmNZww0pdOnv3mT4EW8@z>

Kenji Arisawa <arisawa@ar.aichi-u.ac.jp> writes:
| How can we put subject field when we use mail command on plan9?

At the top, write
	Subject: whatever

and leave a blank line between that and the body of your message.

In other words, rfc822 is optional.