Java EE (Java Enterprise Edition) General Discussion

Hi,
I'm using BouncyCastle and I need to create a Signed and encrypted
mail with attachment having headers like this:

MIME Header

Content-Type: multipart/signed;
protocol="application/x-pkcs7-signature";
micalg=SHA1;

Then an attachment

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

How can I do it with BouncyCastle? I'm not be able to create it, I only create a mail like this:
Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1;

Could you help me, please? Could you give me a real Java class example to do this, please?

Thanks in advance,
Manuela