I have an example of how to connect to Outlook and pull a list of emails in your inbox. It doesn't have email send but that could be easily added by studying the Outlook Object Model documentation.

https://www.topwizprogramming.com/freecode_outlook.html

I've never used this feature in any application, but a quick search has turned up this info on the MailItem.OriginatorDeliveryReportRequested property from the online Outlook Object Model documentation that looks promising:

https://docs.microsoft.com/en-us/office/vba/api/outlook.mailitem.originatordeliveryreportrequested

The Outlook Object Model reference is a good resource for information on various objects, methods and properties concerning MS Outlook. Similar documentation is available for the other Office products.

HTH - Good luck!

My PBNISMTP control has a SetReadReceiptRequested function.

https://www.topwizprogramming.com/pbnismtp.html

My other SMTP example has a function of_SetReceipt.

https://www.topwizprogramming.com/freecode_emailsmtp.html

Greetings, Juan - 

Are you generating/sending Outlook emails via PowerBuilder now? If so, how (PB MailSession objects, OLE, SMTP)? What have you tried? What version of PB are you using?

Regards, John