Comcast is my provider. But I don't want people to see my @comcast email
address. I own my own domain, but need to go through comcast. How do I
change the look of my email name (for recipients) ?

Change it in the properties of the email account you setup for Comcast.
Check the email address field here: Tools menu > Email accounts >
View/Change existing accounts > Highlight the account > Click Change

I have the same sort of arrangment where I have a domain address but use my
cable provider's SMTP server for sending

"Jimmy" <(E-Mail Removed)> wrote in message
news:E0A5932F-974A-479B-8363-(E-Mail Removed)...
> Comcast is my provider. But I don't want people to see my @comcast email
> address. I own my own domain, but need to go through comcast. How do I
> change the look of my email name (for recipients) ?