Comcast email not working and you want to fix it then you can try Signing in to your Comcast Email or Voicemail Service. To do so you can follow these steps
Visit xfinity.com and click the Email or Voice.
Enter the required details such as Xfinity ID and password and click Sign In.
When you get signed in, then you'll be redirected to Xfinity Connect, you can use the dashboard for Comcast email and voicemail service.

https://www.emailsupport.us/blog/comcast-email-not-receiving-emails/