In-game mail between guildmates now is instant, but in the past, it had a 1-hour delay, just like mail between strangers. The change to instant mail made things more convenient, but removed the social interaction of having to meet up with someone to make a transaction if you wanted something sooner. So we’ve reintroduced that delay for that reason. Other conveniences such as auto-completion of names or quickly clearing a mailbox have been left in. This seemed an easy enough call given that someone could create an add-on to do the very same thing, and we felt those sorts of conveniences didn’t impact the fundamental “classic” experience.