A Keymail System
End-to-end Encrypted Email
Sleepy is a Keymail system: an open, standards-based email technology with built-in authentication and encryption.
Keymail is enabled by Domain Key Authorities (DKA) that provide a Public Key Infrastructure (PKI) for Keymail.
Compatibility and Migration
Keymail is fully compatible with standard email.
Furthermore, Keymail Clients enable any email user (e.g., Gmail, Outlook or any SMTP/IMAP user) to send and receive encrypted email without changing their email IDs.