If you are new to Comcast (welcome, by the way), these are the settings to use.
For e-mail
Outgoing mail (SMTP): smtp.comcast.net
Incoming mail: (POP3): mail.comcast.net
For help in setting up mail on a specfic program (e.g.:outlook express) go here:
http://faq.comcast.net/faq/query.jsp?name=Email
Comcast Uses Giga News for newsgroups. To sign up go here: http://online.comcast.net/giganews/
I just noticed in previewing this message that the C in Comcast is automatically capitalized.