1. Enable dockerhub search results in CA
2. search for protonmail bridge; install the version by shenxn
3. Try the following network settings: Network type: Host, imap: 1143, smtp: 1025.
4. Open docker container in console mode
5. Open protonmail bridge in CLI mode by running "protonmail-bridge --cli"
6. Authenticate with "login" command, follow prompts.
7. Copy those credentials into your mail client, replacing the 127.0.0.1 IP address with that of your unraid server.