Open Source Alternatives to Mailgun

A transactional email delivery platform that provides APIs for sending, tracking, validating, and optimizing email messages at scale, offering free starter usage and paid plans for higher volume and advanced features.

Whether you want to cut software costs or escape vendor lock-in, these open source alternatives to Mailgun give you an option you fully own. You can self-host them, so your data stays on infrastructure you control. This page lists 4 open source alternatives to Mailgun. The most popular are Postal, Plunk and Sessy. Most use the AGPL-3.0 or Custom license, and 4 offer an official Docker image.