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Whoever told you this is wrong. The subject line can be anything you want. And in fact if you don't want email coming back in to footprints (not a typical scenario) then you don't need any of the workspace/item/ticket fluff.
That said you probably want replies to come back in so all you need is ticket=[ticket_number]
This used to.. But not sure if it still does.. require you to use a prefix on your record number field. But that's ok because you should be doing that anyways! (And if you're not doing it.. do it now)
That did it. Thanks so much.