Intake Email Request Queue with .MSG attachments

[MichaelSMN]

I created an Intake Email request queue that we are exploring using to capture documents/email previews which would apply the documents into various projects for review and approval.   The csv and pdf in the testing intake queue are showing up in the documents as expected, but any attached .MSG documents are not being added to the request documents via the email intake process.    We are able to add .msg files manually into documents after to confirm it accepts those as documents, but does not appear to be recognizing these as an attachment in an email.  

Is this expected and a limitation with email intake?  Is there a way to turn on acceptance of .msg attachments and applying them in the documents?

Email that was sent to intake included 3 attachments: 

Request (issue) created only captured 2 of the documents (csv and pdf) and is missing .msg attachment: