To: recipient@testcertificates.gov
From: sender@testcertificates.gov
Subject: Invalid keyUsage Critical keyCertSign False Test1
MIME-Version: 1.0
Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg="sha-256"; boundary="----B9F4148D8053A2EA5A89A3EE4B06F159"

This is an S/MIME signed message

------B9F4148D8053A2EA5A89A3EE4B06F159
Content-Type: text/plain

This is a sample signed message.

------B9F4148D8053A2EA5A89A3EE4B06F159
Content-Type: application/pkcs7-signature; name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7s"

[encoded data, 4615 characters]
E0rQQARu2te4Qk4859ELQ1i6Cw==

------B9F4148D8053A2EA5A89A3EE4B06F159--

