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| | S/MIME Freeware Library (SFL)  |
| | An open source implementation of the IETF S/MIME v3 RFC 3369 Cryptographic Message Syntax (CMS) and RFC 2634 Enhanced Security Services (ESS) specifications.
http://www.digitalnet.com/knowledge/sfl_home.htm |
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| | S/MIME Working Group  |
| | The resource site of IETF S/MIME working group, with links to draft specifications. (Internet Mail Consortium)
http://www.imc.org/ietf-smime/ |
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| | SMIME.org  |
| | Promotes email encryption usage, by providing help and references to email encryption products and standards.
http://www.smime.org/ |
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