We’re happy to announce Letter Opener for macOS Mail Version 9 – which is fully compatible with macOS Sierra.

Sierra required a complete rewrite of the plug-in. The upgrade is free for everybody who bought Letter Opener Pro after June 1, 2016. There are discounted licenses available for owners of previous versions.

You can download the upgrade from https://winmail.help/letter-opener-for-macos-mail/download

Download Letter Opener for macOS Mail Version 9 here.