We've recently received a number of emails that requires us to securely login and retrieve emails
at the sending organization/company’s mail system, due to sensitive data.
We would also like to implement a secure email system like theirs for transmitting sensitive documents
and I'm not sure whether we need to sign up for a Service or need a special purpose mail Appliance.
Our emails are not in the cloud. They are hosted onsite using Exchange and an Antispam appliance.