iOS 13 - Mail auto-fetch will not disable

Question

Since iOS 13 Mail seems to auto-fetch new mail every time the iPhone is plugged into any charging source, either Mac or simple wall-wart.
I've always had my iPhone set to manual Mail fetching for all except my actual Apple iCloud account, which is my only IMAP account & only used for official notifications from Apple.
My main email is done over a POP3 structure, intentionally so I don't have a phone-full of emails. These have always been set to only fetch if I launch the Mail app.
I've always had the main Push* setting on, but then setting each individual account except iCloud to Manual. Switching off this main Push seems to have no effect.
*Settings > Passwords & Accounts > Fetch New Data > Push

This has affected every iOS from 13.0 & continues in 13.6
Edit May 2020 - no fix but a rapid workaround  -
iOS iPhone/iPad Mail - rapid mass delete/delete all

Vee Martin · Answer

After several weeks of testing - this doesn't work. All it does is prevent the badges, not the actual unwanted mail fetch

What appears to fix this is to turn off Notifications for Mail
Settings > Notifications > Mail > Allow Notifications.
This does mean that you never see Badges if/when any mail at all is received, so you do have to actually launch Mail to see if it worked… which then loads manually, of course.

Kitty · Answer

If you have push notifications turned off and fetch set to automatically it displays the statement that new data will be fetched in the background only when on power and Wi-Fi. If manually, hourly, every 30, or every 15 minutes is selected, this statement is not shown. Sounds like no matter what is selected it remains in automatic mode.

netnothing · Answer

Sounds like a bug. Wife’s phone will check every night when she plugs it in before bed. Started with iOS 13. She’s uses imap account with manual fetch enabled.

iOS 13 - Mail auto-fetch will not disable

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