So unconfirmed mail.. neat idea, but basically only there because of Spam from platt farmers etc.
The delete all button is poorly placed and well it is too easy for you to delete mail that has been sent to you by guildies, alts, whatever. This is especially a problem when that mail falls into the unconfirmed mail and has items.
I petitioned a GM who said basically said; yeah that sucks but its not our policy to do anything about it.
Come on, first day with a new mail UI and thats the answer you get?
Bad form on whom ever decided how the mail gets filtered and how powerful that button is.