I found a good step-by-step instructions on this topic; and in keeping with what the Internet is truly for, here is a summary and hyperlink to the file I used to configure Exchange 2003 to exchange mail with my ISP (Comcast).
Christensen Software
Exchange 2003 Server Configuration Guide
Configuring a new Exchange 2003 server for Internet email with Pop-con for downloading the email from POP3 mailboxes isn't hard if you just do it step by step as shown in this configuration sample. In this guide we will step through a sample installation of Exchange 2003 for a company we will call "Mycompany". Mycompany consequently owns the Internet domain name "mycompany.com".
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Actually it only takes these four steps:
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Adding your Internet domain name to the recipient policies
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Configuring the SMTP server for inbound email
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Adding a SMTP Connector for outbound emails
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Configuring the email addresses of your users
And this is how to configure the Exchange Server to accept email for mycompany.com and work with POP-con:
>Link to PDF> Exchange ISP configuration
Michael Angelo Consulting Co.
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