When you recall an email, Outlook for Mac sends a new email to the post office, which is then routed back to the recipient’s mailbox, effectively recalling the original email. This.
Outlook Mac Recall Email
From the ribbon, select the Recall Message button, then select OK in the confirmation dialog box. Tip: You can also use Control-click to open the shortcut menu for your message and select Recall. Shortly thereafter, you'll receive a Message Recall Report in your inbox.