Plunk

Open-source transactional email platform

Plunk is an open-source email platform that combines transactional email, marketing campaigns, and automated workflows against a single contact list. It offers a REST API and SMTP relay, event-triggered workflows, dynamic segments, inbound email, email validation, open and click tracking, and a visual/HTML email editor. It can be used as an EU-hosted cloud service or self-hosted via Docker Compose, and is licensed under AGPL-3.0. It also provides an MCP server so AI agents can manage contacts, segments, campaigns, and workflows.

Category: Email & messaging
Pricing: freemium
Free tier: yes
API: yes
MCP server: yes
SDK: no
Open source: yes

#email #transactional-email #email-marketing #automation #open-source #self-hosted #smtp #mcp

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Listed 2026-10-22 · last verified 2026-10-22 · extracted by @cf/zai-org/glm-5.3-flash · confidence 0.95

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API

curl https://toolgrep.com/api/products/plunk