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PKCS#7 offers a signed-only mode which is distinct from
multipart/signed. This mode is more robust to breakage by
transforming MTAs, but it is also unreadable *unless* the receiver
knows how to cope with S/MIME.
See https://tools.ietf.org/html/rfc8551#section-3.5 for more details
about the different formats.
email-print-mime-structure should now be able to handle these messages
and display the structure of their content as well.
Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
Acked-by: Sean Whitton <spwhitton@spwhitton.name>
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