Delete and recover emails in Mail on iPhone - Apple Support
https://support.apple.com/guide/iphone/delete-and-recover-emails-iphb02be90ba/ios
Instead of deleting emails, you can archive them in the Archive mailbox. Go to Settings > Mail, then tap Accounts. Do one of the following: If you’re using an iCloud email account: Tap iCloud, tap iCloud again, tap iCloud Mail, then tap Mailbox Behaviors.
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