Where does outlook get data for 'Mileage' Field

Question

Currently I am creating a Powershell script to send emails although I need to send through a value in the 'Mileage' field.

The email sends fine, although I cannot work out how to add data for the 'Mileage' Field. On inspection it appears this field isnt given in the header. So I would assume that it has to be a HTML tag or something.

If outlook doesnt get this information from the header. where does it get it from? This information may enable me to add it to my message

Thank you

Answer 1

You can display internal data of Outlook item and check in them. – Do not concentrate on message source, but save all MIME attachments: In that answer, please note the registry key SaveAllMIMENotJustHeaders. This can help you to see other parts of the message.

If you won't find it in other MIME parts of the message, then it is possible that it is stored in binary parts of the message, what means that these properties are preserved only inside MS Exchange server, but are stripped if message is sent to server of another type.

You can then always view the MAPI storage (e.g. using mfcmapi tool) to learn more about storage details.