Be able to turn off Notifications on an account-by-account basis.
I don't need to be pinged for every email in every account. Why not allow per-account notification settings -- including maybe different sounds for each account, or none at all?
Many times... when I'm trying to work on an email, I keep getting interrupted by automatic incoming email. It's distracts me and causes me to have to spend time getting back into my thought process. It would be great if I could either schedule a block of time to disable email receipt (but still send) or manually turn it off / back on.