Skip to content

Licence

Copyright © 2026 the Mailr authors.

Mailr is dual-licensed.

GNU Affero General Public License v3

Mailr is free software. You can redistribute it and modify it under the terms of the GNU Affero General Public License, version 3, as published by the Free Software Foundation. The full text is in the LICENSE file of the repository.

In short:

  • Mailr may be used for any purpose, at home or at work.
  • The source may be studied and changed.
  • A changed version that is shared, or offered to people over a network, must come with an offer of its source code under the same licence.

Commercial licence

For users or organisations who cannot or do not wish to comply with the terms of the AGPLv3, a separate commercial licence is available. Please contact the Mailr maintainers for details on obtaining a commercial licence.

You must choose one of these licences to use, modify or distribute Mailr. If you use or distribute it without a commercial licence agreement, the terms of the AGPLv3 apply.

Third-party data

The Docker image includes the fastText language identification model lid.176.ftz by Facebook AI Research, which is used to offer translations. The model is licensed under the Creative Commons Attribution-ShareAlike 3.0 licence; the fastText code is MIT-licensed. Source: fastText language identification (A. Joulin, E. Grave, P. Bojanowski, T. Mikolov, Bag of Tricks for Efficient Text Classification, 2016; A. Joulin et al., FastText.zip: Compressing text classification models, 2016). The file is downloaded unchanged when the image is built.

The help pages in the image (this guide, at /help/ on the server) are built with MkDocs (BSD-2-Clause) and Material for MkDocs (MIT). They include Mermaid (MIT) for diagrams.

The interactive API reference (/api/v1/docs) is drawn with Swagger UI (Apache-2.0), whose two files are downloaded unchanged when the image is built and served from the server itself.

Contributing

Contributions are welcome. By submitting a pull request, you agree to the Contributor License Agreement in CLA.md. No separate signature is needed. Contributors keep the copyright of their work; under the agreement, Mailr can offer each contribution under both licences.