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
The classic email sending library for PHP
A faster, leaner email client and fork of Nylas Mail
Windows eml and mbox viewer.
E-mails, subdomains and names
An automated e-mail OSINT tool
Web and API based SMTP testing
Protects you from spam mails and virus mails effectively with milter
Phishing Campaign Toolkit
Sync Outlook with Google, SOGo or any other CalDAV / CardDAV server
Sync Outlook contacts and calendars with Google
Open source email service with a strong focus on security and privacy
Unified Communications Server
SMTP email proxy and relay server
A program to send mail via SMTP from command line
Powerful Open Source Email Marketing app with analytics & segmentation
Take back control of your email with this mail server in a box