求助关于smime（rfc2633）安全电子邮件协议

有研究过的朋友请提供一些资料，什么都行谢谢。急需阿，有懂mime的也请先教我点他的格式及含义，smime是在mime上的扩展!!!!!!!!!!!
Received: from RsProxy(127.0.0.1) 
by jit-new.com with CMailServer 4.0 SMTP; Mon, 21 Apr 2003 08:48:18 +0800
Message-ID: <000d01c3079f$b22c2d60$910810ac@jitnew>
From: "ww" <[email protected]>
To: "wang wei" <[email protected]>
Subject: hello 
Date: Mon, 21 Apr 2003 08:47:59 +0800
MIME-Version: 1.0
Content-Type: multipart/signed;
protocol="application/x-pkcs7-signature";
micalg=SHA1;
boundary="----=_NextPart_000_0007_01C307E2.B6779740"
X-Priority: 3 
X-MSMail-Priority: Normal  
X-Mailer: Microsoft Outlook Express 6.00.2800.1106
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106This is a multi-part message in MIME format.------=_NextPart_000_0007_01C307E2.B6779740
Content-Type: multipart/alternative;
boundary="----=_NextPart_001_0008_01C307E2.B6779740"
------=_NextPart_001_0008_01C307E2.B6779740
Content-Type: text/plain;
charset="gb2312"
Content-Transfer-Encoding: quoted-printable
------=_NextPart_001_0008_01C307E2.B6779740
Content-Type: text/html;
charset="gb2312"
Content-Transfer-Encoding: quoted-printable<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3Dgb2312">
<META content=3D"MSHTML 6.00.2800.1141" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV></BODY></HTML>------=_NextPart_001_0008_01C307E2.B6779740--------=_NextPart_000_0007_01C307E2.B6779740
Content-Type: application/x-pkcs7-signature;
name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="smime.p7s"MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQA（后省略）------=_NextPart_000_0007_01C307E2.B6779740--