Like Guilds can view every single change in all of their storage crown heaps, it would be a bit useful to review or recall what we have done if we can't remember much or have too much to go through.
Would this be too much open information?
It would also help along other account issues (that shouldn't happen to begin with) when a player's account information gets taken by another, although this wouldn't actually do all that much, it'd give a better idea of what happened to any sort of missing items/cr/ce.

There isn't a history of "sent" mail for players to review so that gives me the assumption that something this far definitely wouldn't come to live.
I've had problems in the past with mistakenly sending a number of mails because I can't view my previous ones so I can't go through what I've already said. Although that's my little problem and that's all caused by myself, having mail history would probably be useful by lots.

..do these even get read by GMs :p