Open source Email clients for macOS

Mailspring

Boost your productivity and send better email with Mailspring, the best mail client for Mac, Linux, and Windows! Mailspring is a new version of Nylas Mail maintained by one of the original authors. (GPL)

Linux - Windows - macOS

N1

N1 is an open-source mail client built on the modern web with Electron, React, and Flux. It is designed to be extensible, so it's easy to create new experiences and workflows around email. (GPL)

Cross-platform

Sylpheed

Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA). (GPL)

Linux - FreeBSD - Windows - macOS

Thunderbird

Mozilla Thunderbird is a free, open source, cross-platform e-mail and news client developed by the Mozilla Foundation. (MPL)

Linux - FreeBSD - Windows - macOS

4 applications