Comcast mobile app is no longer available for you to access your email account. But you still have two ways by which you can use your Comcast email account. One way to access your account is through the web browser, you can follow the same steps for login on a mobile browser.
Another way to access your account is though any third-party application like Mailbird. You can use this application to save your login configuration on this app and you can access your Xfinity email account with just one click.