Can't send messages from Mail from Comcast account - "SMTP not responding"

Using Mail and a Comcast account, I can receive but not send. The error message on trying to configure the outgoing mail server says the SMTP server isn't responding. If I click continue to set up the account in Mail, then go to Mail Preferences and tweak the ports between 587 and 25, triple check the username and password for the outgoing server, etc. -- still no dice.
I wonder if this might be the problem: Is it possible to configure Mail when you're not using a Comcast installed modem? I'm trying to get my Dad's account up and running on my old Mac with my airport extreme to earthlink modem connection (which works fine for Earthlink and .Mac e-mail accounts.) Apple support and Comcast tech support are both stumped on this one, referring me back and forth to each other. HELP!
Thanks.

If I'm understanding this, you are trying to send messages with a Comcast account and SMTP server while connected to the internet with Earthlink?
If so, this is the cause of the problem. All ISPs now have restrictions on using an SMTP server that is outside of their network or not provided by the ISP used for connecting to the internet.
If you are connected to the internet with Earthlink at this house in California, contacting Comcast about a sending problem with their account and SMTP server when connected to the internet via Earthlink is a waste of time. You need to be contacting Earthlink if you are using Earthlink for your internet connection.
Do you also have an email account with Earthlink? If so, you can select/use Earthlink's authenticated SMTP server to send messages with your Comcast email account while connected to the internet with Earthlink or call Earthlink technical support regarding their required settings for an SMTP server that is outside of their network or not provided by Earthlink.

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Can't send messages from Mail from Comcast account - "SMTP not responding"

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