Somehow, my auto log-in was enabled for mail service. There is no way I can find to disable that. I've searched the Web and Comcast and as usual, nothing with Comcast is simple or easy, and of course, they have no customer service dept. That "virtual" problem-solver stuff is totally lame. Any help, THANKS!!!
If you're talking about webmail auto login is a function of your browser using cookies. Check your browser options/preferences and remove any cookies associated with xfinity. Close your browser and start a new session. Next time you go to login to webmail don't allow your browser to store the password.