You can download Mailbox for Mac (beta) here:
http://www.mailboxapp.com/#download
have at them:
https://i.imgur.com/xNXjRXr.gif https://i.imgur.com/quu1POA.gif https://i.imgur.com/dqVbW0K.gif
have at them:
https://i.imgur.com/xNXjRXr.gif https://i.imgur.com/quu1POA.gif https://i.imgur.com/dqVbW0K.gif