complete mail server
SMTP + IMAP + POP3 + Antispam + Antivirus
Web administration + Web email ...on your server in ~5 minutes
GreenMail is an open source, intuitive and easy-to-use test suite of email servers for testing purposes.
Typical use cases include mail integration testing or a lightweight sand boxed mail server for development. GreenMail is the first and only library that offers a test framework for both receiving and retrieving emails from Java.
Mailu, Docker based mail server
Mailu is a simple yet full-featured mail server as a set of Docker images. It is free software (both as in free beer and as in free speech), open to suggestions and external contributions. The project aims at providing people with an easily setup, easily maintained and full-featured mail server while not shipping proprietary software nor unrelated features often found in popular groupware.
Email Finder: Free 50 Verified Email Addresses
Allow to search for verified email addresses for known companies.
Sieve mail filtering script Web UI
Elegant Email Client for Mac
theHarvester is a tool for gathering e-mail accounts, subdomain names, virtual hosts, open ports/ banners, and employee names from different public sources (search engines, pgp key servers).
Email addresses harvester
Fake smtp testing server. Dummy smtp email testing
MJML is a markup language designed to reduce the pain of coding a responsive email. Its semantic syntax makes it easy and straightforward and its rich standard components library speeds up your development time and lightens your email codebase. MJML's open-source engine generates high quality responsive HTML compliant with best practices.
Easy creation of HTML email signature.
Email a file to print@yourdomain.com to print it
The extensible, open source mail client.
Own-Mailbox is a personal email server you can run in your own home, with strong privacy protection measures integrated at its core. It provides self-hosted email addresses, or connects with your existing email address. In both cases, you can seamlessly send and receive encrypted emails from anywhere in the world, through the Own-Mailbox webmail interface, through a smartphone app, or using external email software (such as Thunderbird or Outlook).
Fast, free and open-source spam filtering system.
PEPS is an email, file sharing and collaboration server that intends to fullfil the need for high-quality on-premises software that could rival with top-notch SaaS products such as Gmail or Dropbox, and innovate with new features.
Nowadays many companies and organizations (non-profits, units of governmental and educational institutions, etc) believe that running their own mail servers has become an impossible task, due both to the large amount of inbound spam and to the continuous attempts by spammers to send outbound spam through their mail servers. Companies often lack in-house technical resources to configure and run a mail server properly and deal with these threats. For these reasons, many organizations decide to outsource their email service to external entities.