Can't get most email headers in Outlook Addin API

问题

I'm trying to get all email headers from a selected Outlook email while inside an Outlook Addin.

I've found the Preview API that should allow me to get the headers.

This is what I have tried as of now

Office.initialize = (reason) => {
    headerNames = ["Received-SPF"]

    Office.context.mailbox.item.internetHeaders.getAsync(headerNames, print);
}

print(asyncResult) {
    console.log(asyncResult.value);
}

The problem is when I start to put more headers, the API doesn't return them.

The only ones I get are Received-SPF, DKIM-Signature and Authentication-Results. All other headers (Received, To, X-Microsoft-Antispam-Message-Info, etc) are ignored.

来源：https://stackoverflow.com/questions/55518119/cant-get-most-email-headers-in-outlook-addin-api