For those looking for a replacement: http://postbox-inc http://postbox-inc. I actually just switched a week ago from Sparrow because I wasn't happy with the way

For those looking for a replacement: http://postbox-inc http://postbox-inc. I actually just switched a week ago from Sparrow because I wasn't happy with the way it makes unread mail disappear all the time. I'm growing to love PostBox, and the experience is not hugely different.