I have to use the link »
xfinityconnect.mail.comcast.net/ to access the residential class webmail site. If I click that link and it takes me to the portal page instead because my login cookie has expired, I have to login at the portal page, and then use that link again (not the email icon on the portal page).
Comcast Portal Signin Page
Comcast Email Preview Page
Comcast Email Inbox Page