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How can I fetch the InternetMessageHeaders for sent mail messages in my SENT box using the Microsoft Graph API? I have tried using the following URL: https://graph.microsoft.com/v1.0/me/messages/{id}/?$select=internetMessageHeaders and received the response shown in this image: Reponse in Graph Exploxer.png.
You cannot. Those headers are added by the server(s), only after the message has been sent. The copy of the message stored within the Sent Items folder will not reflect them.
When fetching a thread with multiple messages, how can one identify a reply, forward, or newly composed mail without the internetMessagesHeader?
I'm able to retrieve emails from the Inbox folder using the following URL: https://graph.microsoft.com/v1.0/me/messages/{id}/?$select=internetMessageHeaders. However, when retrieving messages from the Sent folder, the InternetMessageHeaders are not included in the response.
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The answer appears to be that you can get the 'raw' content of the message - with /$value and you can parse the headers yourself