Follow these steps to add Comcast email settings on your own;
Open default mail application on your device
Click on the Other option to set up a Comcast email account
Enter all the credentials including email and password then click on the Sign-in button
After opening the new Comcast or Xfinity window, fill in required details such as ID and passcode
Click on More Options to verify your sign-in process
Now enter your code which you received through text
Now you have done with the process, wait some time to load your mails.
Feel free to contact the email support team if you still have any doubts.