You would use mail.ctyrd.org for your IMAP settings. You will use your full email address as the username and the password you set.The default email account would not work at all for me. The default MX record "mail" set for custom domain. The x13.x10 mail server refused to connect all ports except 25. Never tried smtp ports.
Same for custom email address. Using the x13.x10 as server allow secure connection. Wondering if the Let's Encrypt certificate subdomain "mail" has anything to do with it.
https://intodns.com/ctyrd.org
"Authentication failed. Please check your username/password.
Server returned error: "TLS Negotiation failed, the certificate doesn't match the host., code: 550"