Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: [...]
Message-ID: <smime-signed-enc-hp-shy-legacy@example>
From: alice@smime.example
To: bob@smime.example
Date: Sat, 20 Feb 2021 15:13:02 +0000
User-Agent: Sample MUA Version 1.0

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