So far i have been able to do it in VBA:
Const PR_TRANSPORT_MESSAGE_HEADERS = "http://schemas.microsoft.com/mapi/proptag/0x007D001E"
Dim olkPA As Outlook.PropertyAccessor
Set olkPA = olkMsg.PropertyAccessor
GetInetHeaders = olkPA.GetProperty(PR_TRANSPORT_MESSAGE_HEADERS)
But i want to do it via Python.(i am not looking for someone to convert it for me i am looking the right way to read mail header).