Updating tickets via email

I apologize if I’m asking something that everyone else knows or is documented somewhere that I haven’t immediately found, but I am looking for a list of values that can be used in the subject of an email to change a ticket. Thanks to one post I found, I found that the following subject line can be used to add a hidden tech note to a ticket (ticket #997 in this example):

Ticket:997 Action:TechUpdate Hidden:YES

I feel sure other actions and/or parameters can also be passed though. I’m mostly interested in how to change the status of a ticket (e.g. open, pending, resolved, closed, etc…) via an email. Any and all help would be greatly appreciated!

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