Syncing email
Is there a way to sync mailboxes between my iPhone XR, my iPad Pro (12.9", 2nd generation) and my iMac (21.5-inch, Late 2013)? I have added a few folders on my iMac to help keep things organized - "Packages", "Receipts", "Travel", etc. These do not show up on my iPad or iPhone, but it would be really useful if they did. All three are running up-to-date operating systems. Thanks!