I’m in the same situation as AlBQuirky -I seem to have a “lost” a whole heap of NPC emails, with associated cash rewards. I’d like to a get an answer from Arenanet – does the game ever “auto-delete” old emails? And if so, there really should be a warning.
According to http://wiki.guildwars2.com/wiki/Mail the game should never allow you to delete emails with gold or items attached.
I have never got an “email full” message either (apparently its should tell you)
I’ve emailed support – still waiting on their answer.