Open source Email clients for MAC OS X

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 - MAC OS X

Thunderbird

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

Linux - FreeBSD - Windows - MAC OS X

3 applications