Mail settings - support.microsoft.com
https://support.microsoft.com/en-us/office/mail-settings-30c69a79-efc6-42d2-b740-4bf1c1f8a01c
Go to Mail settings In a web browser, sign in to Outlook Web App using the URL provided by the person who manages email for your organization. Enter your user name and password, and then select Sign in. At the top of the page, select Settings > Options. In the Options pane, select Settings. Change settings for Mail Message options Read receipts
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