Development of Mailbox ended on 26 February 2016. For more information please visit the Mailbox site.
Mailbox is the Mac version of the popular iOS and Android email app, designed to handle email excess simply and quickly. This version for the Mac brings the mobile simplicity to the desktop app to make getting to zero -- and staying there -- a breeze.
Note: Mailbox has been released into public beta, a "betacoin" is no longer required to install.