Could anyone suggest an external encryption solution that would work fine with Zimbra Network Edition? I need to be HIPAA compliant (which most solutions are). What I'm looking for is a solution that would keep the encrypted message on my premises and the receiver would read the encrypted message using a webmail like interface. I know there are plenty of solutions out there but I'm time constrained and I can't test all of them. I would appreciate if someone could point me in the right direction. Thanks.