Ok, the settings you should be using are as follows:
Only If Needed
|Incoming Mail Server - Name || |
|Incoming Mail Server - Port Number || |
|Outgoing Mail Server - Name || |
|Outgoing Mail Server - Port Number || |
|SSL Encryption || |
|Authentication || |
Comcast ID and Password required
Note that Outlook 2011 may be using Port 25 rather than 465 for outgoing:
Click Tools then select Accounts, Highlight the Comcast account.
On the right side account settings pane, In the Outgoing Server box change the port to 465.
Close all windows, Quit Outlook and try again.
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Thanks and good luck,