Mailplane 4
Latest and greatest. Put into service in 2018. It is packed with new features and looks better than ever.
macOS Sierra or higher (10.12+)
Mailplane 3
Was in service between 2013 and 2018. Be warned that we don't actively sell and develop it anymore.
OS X Yosemite or higher (10.10+)
OS X Mavericks (10.9)
OS X Mountain Lion (10.8)
OS X Lion (10.7)
Mailplane 2
Was in service between 2008 and 2013. Be warned that we don't actively sell and develop it anymore.
OS X Lion or higher (10.7+)
OS X Snow Leopard (10.6)
OS X Leopard (10.5)
OS X Tiger (10.4)