i want to see all my mail from all my email addresses across all my mac devices

Hi. I'm going away with my iphone and would like to have access to all my email from all my address INCLUDING the contents of folders I've created ON MY MAC. Currently, when i open apple mail which has all my email addresses/accounts (google, xfinity, etc) on one device, it does not look like it does on another device.

For example, I have folders on my mac mail that I've created to organize my incoming mail. There are emails there I need from anywhere I'm checking mail. But they only appear on my macbook air, NOT my phone.

How do i get emails and email folders created on one mac device to be viewable on another device. I'd like when i open email, despite the device, to see exactly the same things.

Thanks