Browse free open source Email software and projects for Mac below. Use the toggles on the left to filter open source Email software by OS, license, language, programming language, and project status.
Anti-Spam SMTP Proxy Server implements multiple spam filters
Windows eml and mbox viewer.
The classic email sending library for PHP
Web and API based SMTP testing
SMTP email proxy and relay server
E-mails, subdomains and names
Command line management for Google G Suite
Fast Bayesian spam filter along lines suggested by Paul Graham
Unified Communications Server
A full-featured email creation and transfer class for PHP
High performance, self-hosted, newsletter and mailing list manager
Powerful Open Source Email Marketing app with analytics & segmentation
Unofficial ProtonMail Desktop App
A faster, leaner email client and fork of Nylas Mail
A program to send mail via SMTP from command line
Proton Mail Bridge application
An automated e-mail OSINT tool
Zentyal is a Linux Small Business Server
Open source email service with a strong focus on security and privacy
Lightweight Open Source webmail written in PHP and JavaScript
Build and send emails using React