Browse free open source Email software and projects below. Use the toggles on the left to filter open source Email software by OS, license, language, programming language, and project status.
An easy-to-use anti-spam email gateway
Anti-Spam SMTP Proxy Server implements multiple spam filters
Windows eml and mbox viewer.
The classic email sending library for PHP
Protects you from spam mails and virus mails effectively with milter
SMTP email proxy and relay server
Sync Outlook with Google, SOGo or any other CalDAV / CardDAV server
Unified Communications Server
A faster, leaner email client and fork of Nylas Mail
Web and API based SMTP testing
Sync Outlook contacts and calendars with Google
Powerful Open Source Email Marketing app with analytics & segmentation
E-mails, subdomains and names
An automated e-mail OSINT tool
Phishing Campaign Toolkit
Fast Bayesian spam filter along lines suggested by Paul Graham