Why the email host can not be found?


Hi all

I am a new user of Mailpile.
I have created an account with following IMAP information:

After confirming, it shows the following message A network error occurred, therefore I am wondering, if I did something wrong?

What I am confused of, is that I have never been requested to enter any email account password as I did in Microsoft Outlook during email account setup.

Have I missed any setup in Mailpile?

Hint: The MailPile app is running in a docker container and the image is from https://hub.docker.com/r/rroemhild/mailpile. The mail server is https://github.com/tomav/docker-mailserver.