Message recall is available after you select Send and is available only if both you and the recipient have a Microsoft 365 work or school email account in the same organization. Messages sent to or from a Hotmail, Gmail, or live.com account can't be recalled.
Note: This feature is available in Outlook for Mac 16.94 build or later.
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Select Sent in the left folder pane, then double-click the sent message to open it in a separate window.
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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.
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Shortly thereafter, you'll receive a Message Recall Report in your inbox. Select the link in that message to see whether your recall has succeeded, is pending, or failed.