Stellar Data Recovery Professional for Mac can recover your deleted emails from Apple Mail.
Follow the below-mentioned steps to recover deleted emails (Apple Mail):
1) Run Data Recovery Mac software and customize your scan
2) Another interface will get open in which you need to choose the Macintosh HD from which you will recover either the deleted emails (Apple Mail) or the deleted Entourage database.
3) Click on 'Scan' button to start the scan.
4) Let the software finish the scan.
5) Preview the recoverable Mails and other documents from the provided Classic, File and Deleted List
6) Click Recover to retrieve the mails to another desitnation.
Watch the video to recover deleted Apple Mail with Stellar Data Recovery Professional for Mac