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S/MIME (Assure / Multipurpose Internet Mail Extensions) occurs as standard for public key encryption and signing of e-mail encapsulated in MIME. S/MIME is similar to — however incompatible by using — OpenPGP and the older PGP/MIME. S/MIME is the IETF sweetening of the PEM (Privacy Enhanced Mail) specifications of the mid Nineties.
S/MIME functionality is built into a immense majority of modern electronic mail computer software & interoperates between everthing of the as a result (& others):
Microsoft Outlook (since 1999? & Outlook 98)
Microsoft Outlook Express (since 1999?)
Apple Mail (Since Macintosh OS 10 v10.Tercet Panther)
Mozilla (mail) (10Cipher% releases fallowing 0.Nine.Heptad)
Mozilla Thunderbird (everthing releases)
Netscape Communicator (since Threesome.Cypher?)
Lotus Notes (since 1999?)
Novell GroupWise (since 1998 by owning a Cinque.Quintuplet release)
In addition there are many provider of loose S/MIME certificates that chain as much as roots distributed altogether the package above, including:
[https://www.Thawte.com Thawte]
[https://www.VeriSign.com VeriSign]
CAcert (not eventually inside virtually all clients[http://wiki.cacert.org/wiki/InclusionStatus], however offers free server certs too)
What is more there are many loose public directory servers that offer certificate look-search services to produce selecting recipients encoding certificates more comfortable, including:
VeriSign's Public Directory (ldap://directory.verisign.com)
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