In iOS 11, the iPhone and iPad email application (officially called Mail) is configured only to archive incoming messages. However, you can adjust the app so that the first option is always to delete, either by interacting in the inbox or with the email open.
As a result, messages discarded by the user go straight to the recycle bin and no longer to the archived folder. Here's how to confirm the email application of Apple devices to delete unwanted messages instead of archiving them.
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Step 1. Access the "Settings" application on your iPhone or iPad.
Access iPhone settings
Step 2. Look for the "Accounts and passwords" option and touch it.and passwords "on iPhone
Step 3. On the next screen, select the email account you use on the iPhone. Then click on the above address.
Access your email settings
Step 4. On the next screen, touch "Advanced".
Step 5. Notice that in the item about moving discarded emails the option "Archived Messages" is checked. Now, just switch to the "Deleted Messages" item.
Switch to move messages to the trash on iPhone
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