Just FYI, you need to enable SSL on port 995. Your problem could be about someting that comes up once in a while, which is that Comcast "forgets" passwords from the point of view of the mailservers. Can you login to webmail? If so, the simplest thing to do might be to go to Account(at the top of the page)|Users and Settings and change your password. Don't forget to change it in your email client after changing it via the Comcast web site. If you can't login to webmail either, you'll have to call Comcast (1-800-COMCAST)
Thank you for taking the time to post the new password information. I am sure other customers will appreciate the information as well.
Need Email Help? Please post the following information in your post. Do you use XfinityConnect? The Full or Lite version? Do you use an email client? Which one? (Eg; Windows Live mail, Outlook, a smartphone etc.) Which browser/version do you use? And- have you cleared your browser cache? Which operating system? XP, Vista, Windows 7, Mac OS X Details of the problem you are having.
Good to hear others having same problems. I am not crazy or stupid after all. I had to change my password for three days in a row, because EVERY one I changed to was ruled invalid the next time I logged onto Comcast, yet all achieved criteria. Ridiculous. Why not just send customers a notice on home page or special email advising this password change was going to happen. VERY aggravating, as per usual with Comcast.