I am using JSM Cloud, and under systems/mail/Incoming mail. I have my O365 mail server added/authenticated etc. Mail handler has a single line item titled "New issues add Comments for existing issues." for Issue Type [System} Service request.
I don't know if any of this is correct but when I send an email to the SMTP address for the O365 account nothing is received.
Clearly something is missing or misconfigured.