Short answers. Secure Message is an email gateway, not a chat app.
A self-hosted inbound email gateway. It sits in front of the mail you already run and filters inbound mail on the box. Community is free for one domain and one administrator. The one-time-code recipient portal is Professional. You host it. You hold the keys.
No. It is email. Recipients do not install an app or create an account. They open a link and enter a one-time code sent to the mailbox they already have.
Microsoft is retiring Office 365 Message Encryption in favor of Purview. Those products still process mail on Microsoft infrastructure. Secure Message runs on your host, encrypts at rest under your keys, and never sends message content to us to be scored.
Paubox encrypts in transit so mail can land in the recipient inbox over TLS. On Professional, Secure Message holds the message and opens it in a portal after a one-time code, which is the right shape when the content must not sit in a third-party inbox in the clear. You also host the gateway yourself.
It is built for teams that send PHI and other regulated mail: encryption at rest under your keys, audit logs, and the whole path on infrastructure you own. The recipient portal is Professional. We describe it as built to HIPAA safeguards, not as a certification.
No. Point MX at the gateway and relay outbound through it as a smart host. Existing mailboxes stay where they are.
Yes. Community is free for one domain and one administrator. Professional adds the encryption portal, ClamAV, recipient verification, advanced rules, and backups. Enterprise adds Autopilot, eDiscovery, and DLP. See pricing.
A desktop app that fills, signs and flattens PDFs on the workstation. No cloud account, no telemetry. It is a free download, and meant to pair with Secure Message: sign locally, then send through the gateway.
Get a free license or read the install guide.