I have analyzed the message and observed its properties in MFCMapi, however I could not find the PR_MESSAGE_DELIVERY_TIME property. You may confirm if you have sent us the right message or not and share the version of MFCMapi used in your testing. Also send us the snapshot of the MFCMapi showing this property for the same message.
Andi, please tell what you have done to solve the problem? if you have solved it at all. the reason I ask is that I have something similar to that so maybe you could help me now?
If you have any such sample file that posses this issue, you can share it with us here so that we can investigate it further at our end. We’ll look into it for assisting you further.