Open Source Email Tools
Discover 16 open source Email repositories from GitHub, each with an analysis of what it does, key features, use cases and alternatives. Email projects here are most often combined with Self Hosted, API and Security. Last updated October 3, 2026.
16 repositories · updated October 3, 2026
Zero: Self-Host an AI-Powered Email App
Zero is a self-hostable email app that connects services such as Gmail and Outlook in a unified inbox. It combines email workflows with AI agents and is aimed at people who want more control over their email setup and data.
dnyHelpRealm: Manage Customer Support Tickets
dnyHelpRealm is a PHP helpdesk for freelancers and small teams to receive and manage customer support requests by email, web forms, and API. It supports ticket routing, agent workflows, and email-based replies.
himalaya: Manage Email from the Command Line
Himalaya is a Rust CLI for managing email through commands rather than a persistent terminal interface. It connects to common mail services and local mail stores, making it suited to shell workflows and scripts.
mailcow-dockerized: Run a Self-Hosted Email Platform
mailcow-dockerized packages email and groupware services as a Docker-based platform for self-hosting. It suits administrators who want to operate their own mail server and are prepared to manage its deployment and maintenance.