Apache James
The modular, cloud-native enterprise mail server for high-performance messaging and data sovereignty.

The open-source mail hosting and management platform for high-performance self-sovereignty.
Modoboa is a modular mail hosting and management platform built on Python and the Django framework. Architecturally, it serves as a sophisticated orchestration layer that integrates seamlessly with industry-standard mail components like Postfix and Dovecot. By 2026, Modoboa has solidified its position in the market as the leading open-source alternative to proprietary mail suites for organizations prioritizing data sovereignty and compliance. It features a SQL-based backend (supporting PostgreSQL, MySQL, and SQLite), allowing for highly scalable mailbox management. Its technical core includes a built-in webmail client, an administrative dashboard for multi-domain management, and native integration with Amavis and SpamAssassin for security. The platform's modularity is its primary strength, enabling developers to extend functionality through custom plugins. As the industry moves away from centralized SaaS providers due to increasing costs and privacy concerns, Modoboa provides the enterprise-grade tools necessary for managing complex mail environments without the per-user licensing fees associated with traditional providers.
A unified Django-based UI that manages Postfix and Dovecot configurations directly through a database backend.
The modular, cloud-native enterprise mail server for high-performance messaging and data sovereignty.
A high-scale, AI-optimized cloud email service designed for high deliverability and programmatic flexibility.
The premier open-source, Docker-native mail server distribution for privacy-conscious organizations.
Enterprise-grade SMTP relay and email delivery engine for high-volume senders.
Verified feedback from the global deployment network.
Post queries, share implementation strategies, and help other users.
Native integration with RRDtool to provide real-time graphical analytics of mail traffic and server load.
A web-based interface to manage the Amavis quarantine and tune SpamAssassin rules per domain.
Full support for Sieve filters allowing users to create complex server-side mail processing rules.
Automated key generation and DNS record suggestion for mail authentication protocols.
Database-enforced constraints on the number of mailboxes, aliases, and storage per domain.
Support for multiple levels of administrators (SuperAdmin, DomainAdmin) with granular permissions.
Managing hundreds of client domains across multiple servers with separate billing.
Registry Updated:2/7/2026
Avoiding US-based cloud providers for compliance with local privacy laws.
Cost-effective delivery of system-generated emails without third-party fees.