% diagram A1-3

\verbatim
Received: From localhost.DELAWARE by udel-dewey.DELAWARE id a022713
          ;28 Feb 85 2:27 EST
To: uci@udel-dewey
Subject: test message
Date: 28 Feb 85 02:27:16 EST (Thu)
Message-ID: <4057.478423636@udel-dewey>
From: mrose@udel-dewey

ENCRYPTED MESSAGE: TTI TMA
(
MCL/MAIL
RCV/3
ORG/17
IDK/850228072730
KD/e36813a3882eebd1
KD/fa8b8ac657476669
IV/Ef9d283565431b103
MIC/fdb927fb
MAC/50e9de30
)
a13774f652d844762c4fc03c2f4e201b9d2f57eadb00546c
?endverbatim