First, you need to
log into your Cox email account and sign in with your username and password. Next, go to the settings section. Then, select the option to reset your password. You'll be asked to enter the new password and confirm it with your account verification code. Once you've verified your new password, you can now access your account and send emails. This process will only take a few minutes, and you'll have an email address that works again.
See also -
https://writegossip.com/login-into-cox-email-account/