I am looking for an email security solution that meets these requirements

Hello, I am just beginning to learn about E-mail security.  I am looking for an email security solution that meets these requirements:
•      The solution must be cross-platform (Windows, Mac OS X, and Linux) operational
•      The solution must be standards-based, that is, it is interoperable with other products from other vendors using industry standard, documented protocols
•      The solution is free, or can at least be used in a trial-ware mode
•      The solution is independent of the mail server used
•      A public key server is used
•      The solution will integrate with the graphical email clients for all platforms
•      The full message will be encrypted
•      The solution should not allow you to send an encrypted email to a non-participant
•      Everybody I know should be able to exchange secure email

I have looked online but I have had no luck finding somethign that works across all platforms (Windows, Mac, Linux) Any advice you can give me would be much appreciated.  Thanks you in advance for your asisstance.  Have a nice day!
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I don't believe that you will find any thing that would work with multiple platforms.  I have not seen one.  If anyone can find one, I would also be interested in.
The only product really free of charge is a linux server like ubuntu. See here http://howtoforge.net/the-perfect-spamsnake-ubuntu-jeos-9.10

Like i understand all ur requirements are done. If you are not firm with Linux mechanism then use: http://www.collax.com/
These are open source products but they offer a good support and an easy to use webinterface

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Wilder, the product you recommended works only with Lixux environment.  Joe is looking for the software who could work on multiple platforms.
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Rob KnightConsultantCommented:

Aren't we talking about something like S/MIME or OpenPGP here?


hunart these products work over browser so they are compatible to every OS But we need more informations whats really the point of securing emails. Is it the archiving or the protocolls to secure???
Dave HoweSoftware and Hardware EngineerCommented:
Problems you will get with s/mime and/or openpgp (which are otherwise suitable are)

a) there is no easy/free way to REQUIRE that all outbound or inbound mail has such encryption applied

b) both are recipient-initiated encryption - the public key must first be generated by the recipient, before secure mail can be sent to them

c) there isn't a pki keyserver as such; there are public pgp keyservers (but no requirement that recipients register with them) and s/mime uses a hierarchical authority structure, not a keyserver, with the assumption that the sender will obtain the certificate by another method then verify it.

you might want to investigate instead TLS - requiring that your mailserver encrypt (while in transit) mail to and from remote mailservers. that is platform independent as it doesn't require that the client encrypt at all.
JOEinMARYLANDAuthor Commented:
thank you for yoru help.  I chose gpg4win, isafeguard, and flexcrypt to try out.

Have a nice day,
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