Comcast.net supports IMAP / SMTP , This means you don’t have to use the Comcast.net webmail interface! You can check your email and send messages using other email programs (such as Windows Mail, Outlook , Apple Mail, or Mozilla Thunderbird). Using desktop email applications can improve your workflow. They generally offer more options and your email remains available on your computer when you are offline.

Visit: https://www.realmailfix.com/blog/how-to-configure-comcast-email-on-...