Websites to Self Hosted Mail

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Designed to be installed and run on your own server infrastructure, giving you full control over your data.

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Microsoft Exchange Server

Microsoft Exchange Server

Commercial

Microsoft Exchange Server is a robust mail and calendaring server designed for businesses of all sizes, providing enterprise-grade email, calendaring, and contact management capabilities.

Provides complete control over data and infrastructure.
Collaborative
Online Services Social & Communications
Horde

Horde

Open Source

Horde Groupware is a free, web-based suite of applications designed for collaboration and productivity. Built on the robust Horde framework, it offers a comprehensive set of tools including webmail, calendar, task management, and note-taking, providing an integrated platform for individuals and teams.

Comprehensive suite of groupware features.
CalDAV
Office & Productivity Online Services
Zimbra Collaboration Suite

Zimbra Collaboration Suite

Freemium

Zimbra Collaboration Suite is a comprehensive open source email and collaboration platform designed for businesses. It provides a secure and feature-rich environment for email, calendaring, contacts, tasks, and file sharing, supporting on-premises and cloud deployments.

Comprehensive suite of collaboration tools.
Collaborative
Office & Productivity Online Services