Push Notifications For Email
From Arch Hosting Wiki
All webhosting servers (us-west04, 05, 06, 07) have APN keys installed.
Starting from iOS 10.2.1, all users should be able to use the push email notifications.
|Go to Settings -> Passwords & Account
|Go toFetch New Data|
|Check to see ifpush has been enabledandwhether the corresponding mailbox is using it|
|Select Pushed Mailboxes|