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.
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.
Notifo
A multi channel notification service for sending alerts via email, web push, mobile push and sms.
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.
Twake Mail
A multi-platform email client using the JMAP protocol for efficient synchronization across mobile and web interfaces.
OpenSMTPD
An implementation of the server side SMTP protocol for exchanging emails between systems on Unix like operating systems.
Operational
Track critical events and receive instant notifications through a self hosted event tracking and monitoring tool.
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