secure email solution

hello!

I am providing a secure email solution to an organization. The problem
is that they want a solution such that their mail server be integrated
with active directory so that they can provide a single login
facility. So in this regard i found Guardian Digital's Secure Mail
Suit (http://store.guardiandigital.com/html/eng/products/software/mail_overview.shtml)
which provides all such facilities but they costs.

so can anyonw guide me through some alternative free of cost solution, if
there's any, of this Secure Mail Suit.

PS. Its urgent ... kindly communicate ASAP



-- 
Abubakar,
__________
Research Officer,
COMSATS IIT, Abbottabad, Pakistan.
Cell:     ++92-300-6669512
Office:  ++92-992-383591-7 (ext: 222)
Web: www.bakars.com
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