Mail Storage is mainly composed of Mail caches and attachments. You may find that the memory occupied by Mail is particularly large on About this Mac > Storage. You can also control-click a mailbox and select Erase Deleted Items. All deleted emails in Inbox will be removed permanently. Step 2 Click Mailbox > Erase Deleted Items. Step 1 On the Mail app on your Mac, select a mailbox, for example Inbox. To release Mail storage, you have to permanently delete emails from your Mac storage. How to Permanently Delete Emails from Mac Mail If you delete a Smart Mailbox, the messages it displayed remain in their original locations.

Then all emails in the mailbox will be deleted. Or you can select a mailbox to delete it. Step 3 Click the Delete button to remove all emails from Mac. All emails in the mailbox will be selected. Step 1 In the Mail app on your Mac, select the mailbox you want to delete all emails. If you want to remove all emails on Mac, here is a quick way to do it. If you would like to delete multiple emails received or sent on a specific date, enter the date, for example, entering 'Date: 11/13/18-11/14/18' in the search bar. It you want to delete multiple emails from the same person, type the name of the sender in the search bar to find all the emails from the sender. After selecting all the emails you want to delete, click the Delete button, then all the selected messages will be deleted. Open the Mail app on your iMac/MacBook, press and hold the Shift key and select the emails you want to delete. You have to erase the deleted emails to permanently delete them from your Mac to regain the storage space. And by clicking the Delete button, the deleted emails still remain on your Mac storage. It is easy to delete one email on Mac, however, there seems no way to delete multiple emails all altogether. How to Delete Photos in Photos/iPhoto from Mac

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