I'm working on a process where automated emails from our HR's on-boarding software send an email (with email commands) to our ServiceDesk email in order to create a ticket.

The issue here is that the email commands do not work when coming from the email address that the automated mails are sent from. I then had one of our HR folks send the same message with all the same email commands and it worked without issue.

So my question is...what are the requirements for email commands to work?