Excuse me? Why would I possibly have to restore my device as new to believe you, when I have 3 iOS 11 devices and they work exactly how they ddi in iOS 10. That makes zero sense whatsoever.
You dont want to believe me just because you dont want to reproduce the behaviour in the manner I suggest. Still you state that what I say is false.
That's not fair.
I suggest you can add another new yahoo or gmail account and then try to reproduce the behaviour.
Please note that there is no VIP recipient/ addressee in any of the received mails. And I dont open the mail account favorited folders to make them refresh themselves.
Even if I open and close any favorited folder on native mail app to force it to refresh itself and seek mails from the server, none of the mails downloaded subsequently generate any notification either as a banner or in Notification Centre.
Can you provide some configuration details that you have adopted which is making your mail accounts to generate scheduled fetch and notifications for mails downloaded in favorited folders in native mail app (no VIPs configured) on non Push mail accounts.
If you suggest, I can post a video of the erratic behaviour in the manner you suggest. But whether that will lead to a conclusion, is first to be agreed upon before it is uploaded.
Otherwise you can also suggest what details do I provide for your analysis and suggestions.
I guess that if you have just updated iOS 11 over iOS 10.3.3 without setting up as new, it might be retaining the behaviour of the old version (illogical, but otherwise not explainable).
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FYI the email issue was temporary. Emails both on Push and Fetch schedule with multiple accounts now working normally...
Whether you get notifications for Fetched mail accounts also (like Yahoo, Gmail and corporate mail accounts) on folders configured as favorites other than main Inbox.
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Have you by accident enabled low power mode?
No.
Low Power mode is not enabled.