Plunk is an open-source email platform designed for transactional emails, marketing campaigns, and automated workflows managed through a single contact list. It provides a REST API, SMTP support, inbound email handling, and real-time analytics. Plunk can be used via its EU-hosted cloud infrastructure or self-hosted under the AGPL-3.0 license, offering developers an alternative to traditional email delivery services.
Checked on Nov 3, 2026.
Alternative resources
Email platform for developers to send transactional and marketing emails at scale with a focus on deliverability.
Email sending platform for SaaS teams to manage marketing, product, and transactional emails with API and workflow support.
Fast and reliable transactional email delivery service and API for developers, focusing on high inbox deliverability and message streams.