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
SMTP email proxy and relay server
A faster, leaner email client and fork of Nylas Mail
Unified Communications Server
Web and API based SMTP testing
Powerful Open Source Email Marketing app with analytics & segmentation
E-mails, subdomains and names
An automated e-mail OSINT tool
A program to send mail via SMTP from command line
Open source email service with a strong focus on security and privacy
Take back control of your email with this mail server in a box
Fast Bayesian spam filter along lines suggested by Paul Graham
Zentyal is a Linux Small Business Server