Open Source Email & Communication Software
Email & Communication software manages the transmission and receipt of electronic messages, newsletters, and system notifications. These tools provide the necessary infrastructure for SMTP and IMAP services or offer interfaces to organize multiple mail accounts. This type of software serves developers and organizations that need to send transactional emails or push notifications without relying on external providers. By hosting these apps on private servers, you keep message logs and contact lists on your own hardware. This approach ensures that communication history remains private and avoids monthly costs based on message volume.
This page lists 42 open source tools in the Email & Communication category. The most popular are Novu, Ntfy and Docker Mailserver. Most use the AGPL-3.0 or MIT license, and 38 offer an official Docker image.
Novu
A communication infrastructure for sending multi-channel notifications and connecting AI agents to users via a unified API.
Ntfy
Sends real-time push notifications to mobile devices and desktops via simple HTTP PUT or POST requests.
Docker Mailserver
A production ready fullstack mail server providing SMTP and IMAP services within a containerized environment.
Mailspring
A cross platform email client with a local sync engine for managing multiple mail accounts.
Postal
A self hosted mail server for sending transactional and bulk emails from websites and web servers.
Gotify
A self-hosted server for sending and receiving real-time messages via a REST API and WebSockets.
Mail-in-a-Box
A complete mail server appliance that automates the deployment of SMTP, IMAP, and DNS services.
Billion Mail
A self-hosted email marketing and mail server for managing newsletters, promotional campaigns, and transactional messages.
Stalwart Mail Server
A mail and collaboration server supporting IMAP, JMAP, SMTP, CalDAV, CardDAV, and WebDAV protocols.
mailcow
A dockerized mail server suite providing a complete groupware solution with integrated administration and security.
Tuta
An encrypted email, calendar, and contacts service providing end to end encryption across multiple devices and platforms.
Mailu
A full featured mail server deployed as a set of Docker images for easy setup and maintenance.
Roundcube Webmail
A browser based multilingual IMAP client providing full email functionality with an application like user interface.
SimpleLogin
Create email aliases to protect your online identity and prevent tracking across different web services.
Maddy Mail Server
A composable all-in-one mail server providing SMTP and IMAP functionality with integrated security protocols.
Mox
A secure, self-hosted mail server designed for low maintenance and easy setup on your own domain.
Haraka
An event driven SMTP server with a modular plugin architecture for high throughput email delivery.
Plunk
A self-hosted email platform for sending transactional messages, managing marketing campaigns, and automating communication workflows.
AnonAddy
An email forwarding service that creates aliases to protect real email addresses from spam and tracking.
useSend
An open source sending infrastructure for managing transactional emails, marketing newsletters, and contact subscriptions via Amazon SES.
Modoboa
Mail hosting and management platform featuring an administration panel, webmail, and integration with Postfix and Dovecot.
WR.DO
Manage short links, temporary email addresses, subdomains, and file storage through a single self-hosted platform.
SOGo
A collaboration suite providing webmail, calendaring, and address book management with support for open standards.
WildDuck
A scalable IMAP and POP3 mail server that uses a distributed database for email storage.
Notifuse
A self-hosted email platform for sending newsletters and transactional messages with a visual MJML editor.
Bichon
A self-hosted email archiving server that downloads IMAP accounts and provides full-text search capabilities.
iRedMail
A complete mail server solution for mainstream Linux and BSD distributions with comprehensive email management capabilities.
UnInbox
Manage team communication through shared inboxes, conversation notes, and a sender screener for organized email workflows.
SnappyMail
A lightweight and fast web-based email client designed for privacy and modern browser performance.
Cypht
A webmail aggregator that combines multiple email accounts and news feeds into a single unified view.
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