Preventing Read and Delivery Receipts in an Exchange Online environment

I have an environment comprising mailboxes on an MS Exchange Online Plan 2 server and Office 365 / Office 2016 versions of Outlook.

I want to disable all external requests for read and delivery receipts (e.g. requests made by external domains). In fact I have no interest in supporting these for the internal domain either.

What is happening currently is that some external organisations are requesting read or delivery receipts and they are immediately getting the message ""Message was deleted without being read"

This may be because of a document management system that is taking a BCC copy of all incoming and outgoing emails for further processing e.g. the delete without being read might be coming from one of the document management system mailboxes rather than the recipients mailbox.

I am just interested in switching off all read / delivery receipts. Having done some searching I see earlier versions of Exchange allowed a transport rule to be configured that targeted read receipts directly or alternatively allowed message headers to be modified to prevent read / delivery receipts (called Disposition-Notification) - however I can't find these options in the latest version of Exchange Online I am using. See the attachment Capture-2 showing what was available before.

I do however have options that relate to "remote domains" that were not present on earlier Exchange versions. The option disabling "Allow non-delivery reports" appears to be the most promising. See attachment Capture.jpg

It may be the options I am looking for are available but in menus I have not yet found....

PS - I want all the processing to be handled at the Exchange Online Server level and not be rules in Office 365 / Office 2016.

Can anyone suggest what transport rules / settings are needed ?
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