I found this thread: Office 365 Rest API read the In-Reply-To field, but there is no follow up on what happened with this request (or at least I can't find any). I need to know what is the In-Reply-To header for a reply Draft message, so I can send it through the API.
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I found a thread that answers my question: https://stackoverflow.com/questions/38103388/is-it-possible-to-retrieve-the-rfc-2822-or-any-headers-from-an-email-with-the – D. Gencheva Aug 30 '17 at 08:27