Hm. Seems that mail is going to be an NPC-based thing, at a guess. When I tried to use the mail system on Test using /show_window MainHUD.Mail I got the old "You are not currently in a blah transaction." message. So I guess it'll be RP-friendly and you'll have to check in with a postmaster or somesuch. (NOTE: this is all guesswork based on very little testing, so I could be utterly and totally wrong)
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