To avoid stuck read receipts, you'll need to configure Outlook to stop sending read receipts responses automatically or configure Outlook to always ask what to do. If you are using an IMAP account and getting NDRs for read receipts, see Outlook is Sending Unknown MessagesĪfter deleting receipts several times, the user asked how to prevent the problem from recurring. If you are using a Comcast account and messages aren't sending, you need to change your outgoing server to use port 587 or 465 and set Use this following type of encrypted connection to None then click OK.
