So we have a domain name, and I was wondering if there's a comcast service that allows us to set up emails with that domain so that instead of:
the email is:
(neither email is valid, it's just for example purposes)
Are you asking if you can send email like that, or if Comcast would host your domain on the existing email platform?
Comcast doesn't currently do this (we have in the past for Commercial customers). I believe if you're a commercial customer, there's a partnership with O365, though I do not know the details. If you're a Residential customer, you'll need to find a mail hosting company or VPS provider to host your domain.