Mail Message header request returns incomplete data?

New Contributor

Am using the following call to attempt to pull the full header off an email message stored in an Exchange Online user's mailbox:<user UPN>/mailFolders/<mail folder ID>/messages/<mail message ID>=?$select=Subject,InternetMessageHeaders

I receive back most of the header information.  Strangely, what is missing is the one piece of information that I am looking for which is the "To".  The reason I am trying to pull it this way is that once the message lands in its destination EOL is resolving the To field to items from Address Book.  I don't want this but rather the original contents of the message's To field.

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