- Runs in a docker container
- Host an unencrypted, unauthenticated POP3 / SMTP server, proxy connections to this server to authenticated IMAPS and SMTPS
- If this is impossible, connect to IMAPS and SMTPS, cache these mailboxes, and serve them again on an unencrypted server. Mail sent to the unencrypted server by a client should then be re-sent to the backend encrypted server.
- Backend server configuration, hosts, ports, logins, should be done via environment variables