How to set up email on iPhone as server?

I use optimum online email. I have a few other emails as well, for example gmail. I have my email set up on 3 devices (iPhone ipad Mac) and when I delete an email on gmail, it deletes it from all of them. If I delete an email on optimum, I need to delete it on every device, which gets annoying.

How can I set this up differently? I think it's php, or SMTP or something like that that has to do with whether the emails are local or on the server.

Any help would be greatly appreciated and of course awarded best answer!

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