First of all, Open your Favorite web browser, then go to the page of Comcast.net email login with the help of this link xfinity.com and choose the icon of Email.
In this page , you can enter the email address and password of your Comcast email account.
After that, enter the button of login to access your Comcast email account.
Follow above mentioned steps to login your Comcast email account.
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Signing in to your Comcast Email or Voicemail Service
Visit xfinity.com and click the Email or Voice icon in the screen’s top-right corner.
Enter your Xfinity ID and password and click Sign In.
After signing in, you'll be redirected to Xfinity Connect, your dashboard for Comcast email and voicemail service.
Access your email account by clicking Mail or your voicemail by clicking Voice.
Let me know if this helps.
Bruce