Poste.io Alternatives & Competitors

An open source mailserver suite.

Key mailcow features:

Comprehensive Feature Set Open Source Docker-based Deployment Active Community and Support

Open Source

Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.

Key Mail-in-a-box features:

Ease of Setup Full Control Cost-effective Open Source

Open Source

LetterBucket is the all-in-one platform for newsletters, built to deliver an exceptional user experience while making it effortless to grow and monetize your audience.

Visit website freemium $19.0 / Monthly (1k subscribers)

Mailu is a simple yet full-featured mail server as a set of Docker images.

Key Mailu features:

Open Source Lightweight Modularity Docker-based Deployment

Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface.

Key Modoboa features:

Open Source Integration User-Friendly Interface Mail Security

A fully fledged, free email server solution, an open source project (GPL v2).

Key iRedMail features:

Open Source Comprehensive Features Easy Installation Excellent Documentation

Open Source

Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.

Key Zimbra features:

Open Source Cost-Effective Scalability Feature-Rich

Web-based IMAP email client.

Key Roundcube features:

Open Source User-Friendly Interface Extensibility Security

Open Source

Self hosted modern mail server.

Key WildDuck features:

Open Source Modern Protocol Support Scalability Multi-domain Support

Open Source

Postfix Admin is a web based interface used to manage mailboxes, virtual domains and aliases.

Key Postfix Admin features:

User-Friendly Interface Virtual Domain Management Feature Rich Open Source

Axigen is an integrated email, calendaring & collaboration platform, built on a Linux mail server technology.

Key Axigen features:

Integration Capabilities Security Features Cross-Platform Support User-Friendly Interface

Open-Xchange Server 6 is the most advanced Linux based Groupware solution f.

Key OX Open-Xchange features:

Open Source Integrated Suite Scalability Flexibility

Simple, easy and secure mail server with a convenient and simple interface.

Key Emails features:

Cost-Effective Instant Delivery Wider Reach Easy to Document

Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.

Key Postfix features:

Security Performance Compatibility Reliability