Switching from Xfinity to Yahoo

@Preacherswife 

My husband and I are no longer Xfinity customers but still have our email addresses that end with @comcast.net.

When signing on to check our email after a reboot, Xfinity is alerting us to switch to Yahoo but we can keep our the same email.  Is this mandatory or can we keep things as they are without any future problems?

Thank you