hMail Server Alternatives & Competitors

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

An open source mailserver suite.

Key mailcow features:

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

Open Source

Scheduling infrastructure for modern teams. AI-powered calendar intelligence that works across companies, integrates with your tools, and lets AI agents schedule on your behalf.

Key Synced features:

Automated Meeting Notes AI-Powered Summaries Integration with Popular Tools Searchable Meeting Archives

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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

Google's encompassing suite of cloud-based business apps.

Key Google Workspace features:

Integrations Collaboration Cloud Storage Security

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

Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.

Key Microsoft Exchange Server features:

Integration Security Scalability Mobility

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

KerioConnect is a commercial mail and groupware server.

Key Kerio Connect features:

Cross-Platform Support Ease of Setup Integrated Security Features Mobile Device Support

MailEnable is a Windows based mail server and email server program that is packed with the state of the features and functions like antivirus and spam filtering system, webmail management system, cardDAV, CalDAV and much more.

Key MailEnable features:

Comprehensive Feature Set Scalability Integration and Compatibility Cost-Effectiveness

Is a collaboration suite (messaging and groupware).

Key Citadel features:

Open Source Multi-Protocol Support Integrated Solution Scalability

SmarterMail is a next generation email management server that is offering several business collaboration and communication features as well.

Key SmarterMail features:

Cost-Effective Feature-Rich Cross-Platform Support Scalability

Web-based IMAP email client.

Key Roundcube features:

Open Source User-Friendly Interface Extensibility Security

Open Source

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

Key Postfix features:

Security Performance Compatibility Reliability