Instructions to delete all e mails indicate "edit and then tap select all, there is no select all
instructions to delete all e mails indicate "edit" an then tap "select all", there is no select all.
iPhone 8, iOS 12
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If you tap on the Edit button and it doesn’t change anything, something’s wrong. A restart might help.
Restart instructions: https://support.apple.com/en-us/HT201559