Apple released macOS High Sierra yesterday. You can read more about it here.
Mailplane 3 runs on macOS High Sierra. Just make sure you’re on the latest version (3.7.0 or later) by going to “Mailplane 3 > Check for Updates…” or downloading it before you upgrade to macOS High Sierra because older versions won’t start.
Download has started!
Shortly you'll find a .tbz file in your Downloads folder. Simply double-click it to unpack Mailplane. Enjoy!
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