Bonus anti-traffic analysis hack: new wrapped message is always sent
to: postmaster(_at_)recipient(_dot_)com with subject: encrypted message, real
recipient and subject recovered from Subject: and DKIM-Encrypted-To:
headers in the encapsulated message.
Use RFC 2442? Dan Newman had intended from the start that RFC 2442 could
be combined with "something else" to provide end-to-end encryption of
the envelope.
<csg>
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