393 votes21 comments · Feature Requests and Feedback » Microsoft Graph/O365 REST APIs · Flag idea as inappropriate… · Admin →
This feature is currently being tested in private beta. Please reach out to firstname.lastname@example.org if you are interested in reviewing and providing feedback!Yves Dhondt commented
It should go both ways: we should be able to retrieve the entire mime stream as well as put it. This is especially important for sending and retrieving signed and encrypted messages.