Delete all email messages - support.microsoft.com
https://support.microsoft.com/en-us/office/delete-all-email-messages-70763b76-f79b-4d03-9840-b20e5f91e393
To select and delete consecutive emails, in the message list, click the first email, press and hold the Shift key, click the last email, and then press the Delete key. To select and delete nonconsecutive emails, click the first email, press and hold the Ctrl key, click each email that you want to delete, and then press the Delete …
DA: 27 PA: 37 MOZ Rank: 84