My organization has about 300 Exchange mailboxes. I am looking for an appliance which will automatically encrypt outbound e-mails based on policies. My vision is that the recipient would be sent a link to login to the appliance via a browser to view the message. An Outlook plug-in would be nice and a way to encrypt when using OWA would be a requirement.
I've read about the Cisco Ironport box but that's designed for 5000+ users. We have neither the volume or money for that type of a solution. What other products are out there? A software based solution is also a consideration.