Plunk

The Open-Source Email Platform







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Introduction

Transactional emails, marketing campaigns, and workflow automation — in one platform. Self-hostable, $0.001 per email, no contact limits.

An open-source, self-hosted alternative to tools SendGrid, Resend or Mailgun.

Features

• Transactional Emails: Send emails straight from your API with template support and variable substitution
• SMTP: Use Plunk as an SMTP relay to send emails from any existing tool or framework
• Campaigns: Send newsletters and product updates to large audiences
• Workflows: Create advanced automations with triggers, delays, and conditional logic
• Segments: Organize contacts with dynamic filtering and target the right audience
• Contact Management: Manage contacts with custom fields and full activity history
• Analytics: Track opens, clicks, bounces, and engagement metrics in real-time
• Custom Domains: Verify and send from your own domains with DKIM/SPF support
• Inbound Emails: Receive and process incoming emails with custom routing rules

Sponsors

Plunk is made possible by the support of our sponsors. If you self-host Plunk, consider supporting via GitHub Sponsors.

Self-hosting Plunk

The easiest way to self-host Plunk is by using the plunk Docker image. You can pull the latest image from Github.

A complete guide on how to deploy Plunk can be found in the documentation.

Community

• Documentation: docs.useplunk.com
• Discord: useplunk.com/discord

Contributing

You are welcome to contribute to Plunk. You can find a guide on how to contribute in CONTRIBUTING.md.

License

AGPL-3.0 License - see LICENSE for details.