You can fix your email by making sure that it is updated with your correct username and password. You also want to ensure that your personal settings are enabled. You should receive a notice of any email address or device configuration changes. Sometimes the error Comcast Xfinity email not working occurs if your Account has not been used for a long time. They could be restricting access to updates on your Account. To resolve these issues, you will need to reach out directly to customer service through chat or Phone. If other devices are accessing your Account, like a tablet or smartphone, then make sure they are also up-to-date.