I have what is a bit of an odd business request - we have a distribution group, and when any email is sent on behalf of that group, it needs to CC itself. Since exchange mail flow rules don't seem to allow you to directly reference distribution groups, we originally had it set up like: if the sender is [distribution group] bcc a mailbox that just exists to forward emails back to the distribution group. This works in the sense that any message sent from the distribution group will make it's way back to the group; although I'm now being asked to change this flow so that any message from [distribution group] will just add [distribution list] to the CC field of any email sent.
Is this possible with Exchange online? I saw some solutions online that would work assuming we managed our own SMTP server, but we don't so those won't work for me. Maybe some method of just directly altering the message headers through powershell, or something similar?