Open Source Email Platforms Software
Email Platforms software manages the sending, receiving, and storage of electronic messages through SMTP and IMAP protocols. These tools handle the routing of transactional alerts, bulk newsletters, and personal correspondence while managing associated calendars and contact lists. This type of software serves administrators and businesses that need to host their own mail servers. By self-hosting these apps, you keep message archives and sender identities on your own hardware. This approach removes reliance on external providers for the delivery of sensitive business communications.
This page lists 30 open source tools in the Email Platforms category. The most popular are Docker Mailserver, Postal and Mail-in-a-Box. Most use the AGPL-3.0 or MIT license, and 28 offer an official Docker image.
Docker Mailserver
A production ready fullstack mail server providing SMTP and IMAP services within a containerized environment.
Postal
A self hosted mail server for sending transactional and bulk emails from websites and web servers.
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.
Mailu
A full featured mail server deployed as a set of Docker images for easy setup and maintenance.
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.
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.
Forward Email
Privacy focused email service providing encrypted forwarding and full mail server capabilities for custom domains.
DoubleZero
A self-hosted email API and dashboard for sending and monitoring emails using Amazon SES infrastructure.
Dovecot
An open source IMAP and POP3 email server designed for high performance and security.
Open Trashmail
Self-hosted temporary email solution for receiving messages via web interface, JSON API, and RSS feeds.
Sessy
Track AWS SES deliveries, bounces, opens and clicks through a self-hosted dashboard with real-time search and analytics.
DavMail
A gateway that enables any mail client to connect to Exchange and Office 365 servers.
Hyvor Relay
A self-hosted email API for developers to send transactional and distributional emails using their own infrastructure.
Cyrus IMAP
An email, contacts, and calendar server designed for high scalability and secure mailbox management.
OpenSMTPD
An implementation of the server side SMTP protocol for exchanging emails between systems on Unix like operating systems.
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