Email

I have Cox email and get it through Outlook on my PC. I have an IPhone X, an IPad and my husband has an IPad. Our Cox account is on all of our devices.

Right now, my email on my PC is independent of our other devices, i.e. if I delete an email on our iPhone or IPads, it remains on our PC which is how we want it. How do we get the IPhone and IPads to work the same. I would like some emails to be deleted from my iPhone/IPad that my husband would like to remain on his IPad and vice versa. Now if he deletes an email from his iPad, it deletes it from my iPhone and IPad   

Am I asking the impossible?