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useplunk/plunk

An open-source, self-hostable email platform for transactional emails, marketing campaigns, and workflow automation.

Core Features

Send transactional emails via API with template support and variable substitution

Use as an SMTP relay for existing tools and frameworks

Create and send newsletters and product updates to large audiences

Build advanced automations with triggers, delays, and conditional logic

Track opens, clicks, bounces, and engagement metrics in real-time

Detailed Introduction

Plunk is an open-source, self-hostable email platform designed to consolidate transactional emails, marketing campaigns, and workflow automation into a single, cost-effective solution. It offers a compelling alternative to commercial email service providers by providing features like API-driven transactional emails with templating, SMTP relay, advanced campaign management, dynamic contact segmentation, and real-time analytics. Its self-hosting capability via Docker allows users to maintain full control over their email infrastructure, offering significant cost savings and no contact limits, making it ideal for businesses seeking a powerful yet flexible email communication system.