Samsung S8, How can I delete an email from phone, not computer?

On my new Samsung S8, I can't see how to set it up where I can delete an email from my phone, but, not from the computer. I get a ton of e-mails on the account & want to not have them clogging up my phone's email, but, would like to keep some of them on the computer.

I have looked everywhere on settings, server settings, notifications, apps. Where is it? If I use the Comcast App instead of the email app that came with the phone, can I delete emails from phone, but, not computer?

I can't believe I can't find it anywhere. If they deleted this feature from the phone,  I will likely return the phone.