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
Sync Outlook with Google, SOGo or any other CalDAV / CardDAV server
SMTP email proxy and relay server
Sync Outlook contacts and calendars with Google
Web and API based SMTP testing
Unified Communications Server
E-mails, subdomains and names
A faster, leaner email client and fork of Nylas Mail
Powerful Open Source Email Marketing app with analytics & segmentation
Open source email service with a strong focus on security and privacy
A full-featured email creation and transfer class for PHP
Client daemon to move mail from POP and IMAP to your local computer
Fast Bayesian spam filter along lines suggested by Paul Graham