Sure, but not in 1.1 with the native classes.  You'll need some interop to
CDO and CAPICOM.

http://support.microsoft.com/default.aspx?scid=kb;en-us;280391

There are also 3rd party libraries that support this.

..NET 2.0 has some nice pkcs7/CMS support that will take care of the crypto
part and has a much improved MIME stack that should take care of the email
message part, so this should be easier there.  I haven't actually tried
doing an end-to-end solution with it yet though.

Joe K.

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Hello!
You wrote  on Wed, 16 Mar 2005 17:05:09 +0100:

See http://www.eldos.com/sbb/net-mime.php

With best regards,
Eugene Mayevski

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