Plunk
Plunk is an open-source email platform for transactional emails, marketing campaigns, and automated workflows against a single contact list.
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About Plunk
Plunk is an open-source email platform. It provides transactional email, marketing campaigns, and automated workflows, all managed against a single contact list.
What you can do
Build event-triggered workflows containing emails, delays, conditions, branches, and webhooks.
Create dynamic audience segments that automatically update as contact data and behavior change.
Deliver inbound email headers, body, and attachments as real-time JSON to an endpoint webhook.
Edit email templates using a visual formatting toolbar or by writing custom HTML in code mode.
Send email over SMTP with open and click tracking across verified domains.
Connect Model Context Protocol (MCP) clients to manage contacts, segments, templates, campaigns, and email sends.
Preview email templates populated with real contact data across desktop, tablet, and mobile screen widths.
Insert dynamic contact variables with autocomplete, nested property support, and fallback values into email templates.
Create static contact lists with manually selected members whose membership remains unchanged until updated.
Configure workflow sequences to terminate early once a contact completes the target action.