Since formats haven't been finalized yet, these examples are explanatory rather than reference.

Original, unencrypted mail from Bram Cohen to Russ Nelson 
Date: Wed, 26 Dec 2000 20:24:53 -0800 (PST)
From: Bram Cohen <bram@something.com>
To: Russell Nelson <nelson@crynwr.com>
Subject: Envelope Mail format
X-Envelope-Info: bram@something.com snoaSNTHheuSgdS2NTH9586vuylr549NH86234sabkhuaoNTHlsoaeud39845NSTH
Message-ID: <Pine.LNX.4.21.0012302015020.11641-100000@something.com>

Given the current total lack of encrypted mail in the world, I would like
to undertake to create a new format which only stops passive attacks but
is usable...
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