How to retrieve emails
Lost all the emails in my mailbox. Is there anyway i can retrieve them? They just disappeared while i was sending out an email
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Sure, restore from your Time Machine backup. Restore the Mail app to a point you know when you had the emails.
Restore mailboxes and their content in Mail on Mac
Also, please refer to https://support.apple.com/guide/mail/if-emails-appear-to-be-missing-mlhlp1224/14.0/mac/11.0