I have an iPhone 7 Plus running iOS 10.2.1, late 2009 MacBook Pro running 10.11.6, and an 2013 iMac running 10.12.3. Lately I have been experiencing problems with the Mail app on my iPhone. I have one iCloud email account and one Gmail account for business using IMAP. When deleting or archiving a message from my iPhone, the changes are almost instant on my computers. However, when managing my email on one of my computers, if I delete or archive a message the change doesn't show up on my iPhone. Even deleting a message directly on iCloud.com doesn't push the change to my iPhone. I have tried removing the accounts, resetting my iPhone, etc. Nothing. Any ideas?