Vendors of PEM, MOSS or S/MIME?

Which vendors sell (or plan to sell) implementations of PEM, MOSS or S/MIME?

I'm writing an article about doing EDI securely over the Internet.
I'd like to include the names of these vendors in my article,
which will be published soon in E-COMM magazine. The circulation is
roughly 40,000.

Thanks.

Bob Lyons
EDI & Internet Consultant
Unidex, Inc.
1-908-975-9877
boblyons(_at_)unidex(_dot_)com
EDI Help Desk: http://www.wwa.com/unidex/edi/