To submit a junk or phishing scam message to Microsoft:
Create a blank email message.
Address the message to the Microsoft team that reviews messages, as follows:
For junk messages: email@example.com
For phishing scam messages: firstname.lastname@example.org
Copy and paste the junk or phishing scam message into the new message as an attachment.
To do this after creating your blank email and choosing Junk or Phishing to send the email to you will Attach Outlook Item and choose the email.
No Subject is needed, at this point you can send this to Microsoft Office 365 for analysis.