I am diligently trying to find a solution for email encryption that is easy and simple. I simply want to be able to send encrypted email that can be opened by the user with little or no work, case in point pgp. Having to manage keys for 500 or so people is not my idea of fun. Is there any add-ons or anything that can be done with Zimbra to were I can simply send an encrypted email to another person without the headache of key mgmt. Basically I would love to have the capability of sending an email to someone and when they open it they just have to input a password to view the message, ideal. Any Suggestions would be greatly appreciated.

using Zimbra Server 5.0.2