A reader request asked how to force users to send read receipts. This is a client-side feature so the settings involved differ from client to client. We explore how to control them in OWA and Outlook for Windows. A mixture of PowerShell and system registry settings help create a solution. We’re leaving figuring out how to manage other clients to our readers.
https://office365itpros.com/2021/10/13/manage-client-read-receipt-settings-owa-outlook/
