1MIME-Version: 1.0
2From: Dave@example.com
3To: Bob@example.com
4Subject: enveloped then opaque-signed sig.SHA512 then opaque signed by dave
5Content-Type: application/pkcs7-mime; name=smime.p7m;
6    smime-type=signed-data
7Content-Transfer-Encoding: base64
8Content-Disposition: attachment; filename=smime.p7m
9Content-Description: S/MIME Cryptographic Signature
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