To: recipient@testcertificates.gov
From: sender@testcertificates.gov
Subject: Invalid Long Serial Number Test 18
MIME-Version: 1.0
Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg="sha-256"; boundary="----5EFC59493E142CED94D413D1CB97BC30"

This is an S/MIME signed message

------5EFC59493E142CED94D413D1CB97BC30
Content-Type: text/plain

This is a sample signed message.

------5EFC59493E142CED94D413D1CB97BC30
Content-Type: application/pkcs7-signature; name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7s"

[encoded data, 4615 characters]
mpUY2RAZGDXGCwsFkvwl3pkHgCOmr+A9SHG5Mg==

------5EFC59493E142CED94D413D1CB97BC30--

