The first thing that you should do if your Comcast email login not working is to check your internet connection. If your connection is slow, you can try loading an unfamiliar webpage or restarting your modem. If that still does not fix your problem, try changing your email account configuration. Also, make sure that you're using a compatible browser. If your browser isn't working properly, you should try to disable any third-party applications that might be conflicting with your Comcast email.