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.