I imagine somebody must be doing this: I have an eFax system that delivers to an email inbox. HelpSpot happily accepts it, but i need to set Opened Via to Fax for a number of reasons (reporting, automation rules, etc.).
I thought this would either be a propery of the mailbox itself, an action for a mail rule or automation rule, or a parameter to private.request.update, but I can’t seem to find it. Any advice?