internetMessageHeaders is not returned for send emails

[Gordss]

Is your feature request related to a problem? Please describe the problem.

I am trying to get the internetMessageHeaders for every email in the mailbox. I noticed that for emails that are send - the API doesn't return this if you make https://graph.microsoft.com/v1.0/me/messages/messageId?$select=internetMessageHeaders. The only workaround that I've think of so far is to get the message as a stream https://graph.microsoft.com/v1.0/me/messages/messageId/$value and I parse it with MailKit MimeKit.MimeMessage.LoadAsync(messageStream)

Describe the solution you'd like.

I would like the prop internetMessageHeaders to work also for send emails but not only for received.

Additional context?

No response

[lramosvea]

@Gordss Thanks for raising this issue. Please provide the request ID and timestamp that corresponds to your request.

[Gordss]

@lramosvea I created a test request:

• request-id: ee05148c-14eb-45e6-b172-769ba8e5b5b5
• Date: Tue, 10 Mar 2026 07:44:58 GMT

I think this can be reproduced easily for every email that is sent from a mail box