And here are the steps you can follow to recover deleted email on mac
1 install on your Mac computer.
2 Start and choose your volume from the list by disk and volume. Select the physical disk if no volume is presented
3 select the type of scan to find the data you are looking for. Select the Deleted files scan for. Or choose the Lost files scan for recovering files in the case your volume is corrupt or has been initialized. Or, if you selected a physical disk in step 1, choose Lost volumes scan for recovering lost volumes.
4 it will show the lost or data and volume name in the list .you can press on view file and then on any image file name to show a preview of the file .another way ,you can click on Thumbnail to view the file .
5 choose the folder or files you want to recover .you can select the multiple file with drag the mouse down and draw a rectangle.