MIME-Version: 1.0
Date: Tue, 21 Nov 2023 20:50:06 +0000
From: Alice@example.com
To: Bob@example.com
Subject: enveloped then opaque-signed sig.SHA1
Content-Type: application/pkcs7-mime; name=smime.p7m;
    smime-type=signed-data
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=smime.p7m
Content-Description: S/MIME Cryptographic Signature

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