In Outlook Web Access, though we can not recall a message, we have another feature called undo send. Please open Settings-Mail-Compose and reply-Undo send.
To recall a message, open it in a new window by double-clicking on it in the Sent items folder. Then, go to the Actions tab in the ribbon and click on Recall ...
Recall a message in Outlook on the web Select Sent Items in the left folder pane, then double-click the sent message to open it in a separate window. Recall Message, then select OK in the confirmation dialog box. Shortly thereafter, you'll receive
To recall an email message sent in error in classic Outlook, follow these steps: On the Message tab, in the Move group, click Actions > Recall This Message.
To unsend an email in Outlook, first go to the Sent Items menu. Next, double click on the message you wish to recall until it pops up in another window.