Mute Letter Notifications

Letters are huge source of communication throughout the WoX site, like roleplaying and sending reminders and such. But sometimes the amount of notifications from a large group letter can become a little overwhelming. I've heard this voiced quite a few times by other users, and decided that the option of muting letters/Owls on WoX would be a good idea. Without the constant notifications, users could get some other-site work done more efficiently, and then get back to their letters later. If the muted option gets added, I'd hope for an unmute button as well, if a user ever changes their mind.