Open Source Email Tools
Email remains a core way to communicate, send account notifications, and reach audiences. The technology spans inboxes, mail servers, delivery protocols, and campaign systems. Open source email tools can help people manage messages, run their own infrastructure, send transactional mail, and reduce reliance on proprietary services. They also address practical needs such as deliverability, spam prevention, encryption, and control over stored data.
The category includes email clients, self-hosted mail servers, sending APIs, newsletter platforms, command-line tools, and services for routing or monitoring messages. When choosing a tool, consider its maturity, license, maintenance activity, deployment requirements, and compatibility with existing providers and standards such as SMTP. Security practices, privacy features, and expected delivery volume also matter. These tools are useful to individuals, developers, organizations, and operators who want more control over email workflows or infrastructure.
14 repositories · updated October 3, 2026
relay: Send Email Through Your Own Infrastructure
Hyvor Relay is a self-hosted email API that sends mail through your own SMTP infrastructure. It suits teams that want control over delivery operations, logs, and tenant or project separation rather than relying on a hosted sending provider.
Zero: A Self-Hosted AI Email App
Zero is an open-source email app for managing accounts from providers such as Gmail and Outlook, with AI features and a focus on privacy. It suits people who want a customizable inbox they can self-host.
Novu: The Open-Source Notification Inbox Infrastructure
Novu is an open-source notification infrastructure designed to simplify multi-channel communication for modern products. It provides a unified API to send notifications via email, SMS, push, chat, and in-app channels. Developers can easily integrate a real-time notification inbox and manage complex workflows with this powerful platform.
00: Self-Host an AWS SES Email Dashboard
00 is a self-hosted dashboard and API for sending email through AWS SES and tracking delivery events. It connects SES notifications through SNS and SQS so developers can search messages and monitor recipient-level status in one place.
aliasvault: Manage Passwords and Email Aliases Privately
AliasVault combines an encrypted password manager with disposable email aliases and a built-in email server. It suits people who want cross-platform access and the option to self-host their credentials and alias service.
forwardemail.net: Secure, Open-Source, and Privacy-Focused Email Service
forwardemail.net offers a 100% open-source and privacy-focused email service, providing an all-in-one alternative to popular platforms like Gmail, Mailchimp, and Sendgrid. It emphasizes encrypted communication and custom domain support, making secure email accessible for everyone. This project is ideal for users and developers seeking a robust, self-hostable email solution.
keila: Create and Send Newsletter Campaigns
Keila is a newsletter platform for creating campaigns and sign-up forms, with options to send through an existing inbox or supported email delivery services. It suits teams that want a hosted service or the option to run their own instance.
useSend: Send Transactional and Marketing Email
useSend is a self-hostable email platform built on Amazon SES, with a dashboard and APIs for transactional and marketing email. It suits teams seeking an alternative to hosted email services who are prepared to operate the supporting infrastructure.
disposable-email-domains: Block Disposable Email Addresses
A maintained domain list for identifying disposable and temporary email addresses during account registration and other validation workflows. Use it as data for your own checks, with matching logic that accounts for public-suffix domains.
Zero: An Open-Source AI Email Solution for Privacy and Self-Hosting
Zero is an innovative open-source AI email solution designed to modernize email communication while prioritizing user privacy and safety. It allows users to self-host their email application and integrate various providers like Gmail, offering a unified and customizable inbox experience. With a strong focus on data privacy and AI-driven enhancements, Zero aims to be a transparent and powerful alternative to traditional email services.
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.