Cableone.net mymailmcd
It looks like you're trying to access your email account on Cable One's website!
To help you with that, I'll provide you with the correct format:
https://mymail.cableone.net
This should take you directly to your Cable One email account login page. Simply enter your username and password to access your email.
If you're having trouble accessing your account or need assistance with your email settings, you can contact Cable One's customer support team for help.