About Plunk
Plunk is an open-source, self-hosted transactional email platform that handles transactional emails, marketing campaigns, and automated workflows from a single contact list. It targets developers, product and marketing teams who want full control, no per-contact limits, and flat pricing at $0.001 per email.
Key Features
Architected for observability and control, Plunk lets you trigger actions from code, build end-to-end flows, and keep a single, up-to-date contact history. This setup matters when you need predictable deliverability and auditable workflows:
Inbound Email
Add one MX record and every address at your domain starts receiving. Replies become contacts and trigger workflows like any other event.
Workflows
Visual editor to design end-to-end automation; triggers fire from your app events and you see the full workflow on the canvas.
Segments
Audiences stay current by re-running a query each time you send; tomorrow’s campaign targets the updated segment.
SMTP
Connect any SMTP client or library to Plunk without modifying your app.
Summary
Best for engineering teams, platform teams, and growth/marketing squads running transactional emails and automated workflows at scale.
