High performance, self-hosted newsletter and mailing list manager with a modern dashboard.

Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container. Only configuration files, no SQL database.

Complete and fully featured mail server for use by websites & web servers.

Turns any Ubuntu server into a fully functional mail server with one command.

Mail server suite based on Dovecot, Postfix and other open source software, that provides a modern Web UI for administration.

All-in-one mail server with JMAP, IMAP4, and SMTP support and a wide range of modern features.

Marketing automation software (email, social and more).

Simple yet full-featured mail server as a set of Docker images.

Browser-based IMAP client with an application-like user interface.

Open source email alias solution to protect your email address. Comes with browser extensions and mobile apps.

All-in-one mail server that implements SMTP (both MTA and MX) and IMAP. Replaces Postfix, Dovecot, OpenDKIM, OpenSPF, OpenDMARC with single daemon.

Complete e-mail solution with IMAP4, SMTP, SPF, DKIM, DMARC, MTA-STS, DANE and DNSSEC, reputation-based and content-based junk filtering, Internationalization (IDNA), automatic TLS with ACME and Let's Encrypt, account autoconfiguration, and webmail.

Fast, highly extensible, and event driven SMTP server.

Email forwarding service for creating aliases.

Mail hosting and management platform including a modern and simplified web user interface.

Omni-channel customer engagement and messaging automation platform (alternative to Braze, Customer.io, Iterable).

Luke Smith's bash script to completely automate the setup of a Postfix/Dovecot/SpamAssassin/OpenDKIM server on debian.

Scalable no-SPOF IMAP/POP3 mail server.

Reliable and easy-to-use newsletter tool (alternative to Mailchimp and Sendinblue).

Full-featured mail server solution based on Postfix and Dovecot.

Simple, modern, lightweight & fast web-based email client (fork of RainLoop).

Privacy-focused encrypted email for everyone. All-in-one alternative to Gmail + Mailchimp + Sendgrid.

Feed reader for your email accounts.

Your Debian-based data center in a box. A set of general-purpose Ansible roles that can be used to manage Debian or Ubuntu hosts.

IMAP and POP3 server written primarily with security in mind.

Complete trashmail solution that exposes an SMTP server and has a web interface to manage received emails. Works with multiple and wildcard domains and is fully file based (no database needed). Includes RSS feeds and JSON API.

Newsletter and email marketing with advanced management of subscribers, bounces, and plugins.

POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client with an Exchange server, even from the internet or behind a firewall through Outlook Web Access.

Email (IMAP/POP3), contacts and calendar server.

Secure SMTP server implementation from the OpenBSD project.

Complete mailserver solution leveraging the Nix Ecosystem.

Mailing list manager.

A small MTA for home and office use. Works on Linux and FreeBSD.

Access GNU Mailman v3 archives.

Web user interface to access GNU Mailman.

Complete email solution that runs on any webspace with PHP and MariaDB. It supports POP3 catchall mailboxes and can also integrate with Postfix or b1gMailServer if you're running your own server.

SMTP (email) server with a focus on simplicity, security, and ease of operation.

Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services.

SMTP server that sends and receives emails according to a simple configuration file, with an optional web interface that you can use to browse your emails.

A small and easy to configure SMTP and POP3 server for Windows and Linux.

Message transfer agent (MTA) developed at the University of Cambridge.

Lets you have an infinite number of unique inboxes.

Manage electronic mail discussion and e-newsletter lists.

Fast, easy to administer, and secure Sendmail replacement.

GPG-enabled mailing list manager with resending-capabilities.

Message transfer agent (MTA).

Self-hosted email newsletter application that lets you send bulk emails via Amazon Simple Email Service (SES) or other SMTP services.

Another browser-based IMAP client.