Stalwart JMAP Server

Build License: AGPL v3

Stalwart JMAP is an open-source JSON Meta Application Protocol server designed to be secure, fast, robust and scalable. JMAP is a modern protocol for synchronising data such as mail, calendars, or contacts that makes much more efficient use of network resources.

Key features:

Get Started

Install Stalwart JMAP Server on your server by following the instructions for your platform:

All documentation is available at

Note If you need a more comprehensive solution that includes support for IMAP (Internet Message Access Protocol), you should consider installing the Stalwart Mail Server instead.


If you are having problems running Stalwart JMAP, you found a bug or just have a question, do not hesitate to reach us on Github Discussions, Reddit or Discord. Additionally you may become a sponsor to obtain priority support from Stalwart Labs Ltd.


Part of the development of this project was funded through the NGI0 Entrust Fund, a fund established by NLnet with financial support from the European Commission’s Next Generation Internet programme, under the aegis of DG Communications Networks, Content and Technology under grant agreement No 101069594.

If you find the project useful you can help by becoming a sponsor. Thank you!


Licensed under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. See LICENSE for more details.

You can be released from the requirements of the AGPLv3 license by purchasing a commercial license. Please contact [email protected] for more details.

Copyright (C) 2023, Stalwart Labs Ltd.