Plunk
Send transactional emails, run marketing campaigns, and automate workflows with a self-hostable, privacy-first email platform. Pay per email sent with no contact limits.
Plunk is an open-source alternative to:
Plunk
Plunk is an open-source, self-hostable email platform designed for transactional emails, marketing campaigns, and automated workflows. Built with privacy in mind, it offers transparent pricing, no contact limits, and full control over your email infrastructure.
Key Features
- Transactional & Marketing Emails: Send both transactional emails and marketing campaigns from a single platform.
- Automated Workflows: Trigger workflows based on events sent from your code, with a visual canvas for full transparency.
- Inbound Email Handling: Receive emails at your domain by adding an MX record, turning replies into contacts and triggering workflows.
- Unlimited Contacts: Store unlimited contacts for free; pay only per email sent ($0.001 per email).
- Self-Hosting & Open Source: Fully inspectable, forkable, and self-hostable under AGPL-3.0 license.
- MCP Server Integration: Connect AI agents (Claude, Cursor) to manage emails via the Model Context Protocol.
- Email Editor & SMTP: Visual editor for emails or direct HTML editing, plus SMTP support for existing clients.
- Analytics & Segments: Track delivery, opens, clicks, and bounces per send, with dynamic segments that update in real-time.
Tech / Self-Hosting
- License: AGPL-3.0
- Hosting: EU-based cloud or self-hosted via Docker Compose
- GitHub Stars: 5,000+
- Setup Time: Under 5 minutes for domain configuration and first send
- Exit Strategy: Full control via Docker Compose for seamless migration away from the cloud service.