deleting emails on multiple devices

My wife and I share one Yahoo! email accounts on two iPhones, a 6 and a 6s, aniPad and two MacBook Pros. When an email is deleted on one device it is not deleted on the other devices. How can we get our devices to sync so that an email deleted on one device, is automatically deleted from all the other devices?

Let me reframe the question. Our five apple devices are synced on one iCloud account, but it appears that the Yahoo! mail client/server is not synced, at least and far as deleting emails is concerned. How do we get our Yahoo! mail account to fully sync to all of our devices. Thanks