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That’s Google’s choice, not Apple’s lack of support.

Source? I thought Apple gated XAPPLEPUSHSERVICE so 3rd party accounts on the mail.app fallback to fetch/poll.

Push works with Yahoo and Exchange. Google used to allow it, but stopped (apparently in 2013): https://www.engadget.com/2013-03-26-gmail-push-notification-...

Also with FastMail. (I don’t use them but they’re on the top of my list next time I decide to switch.)