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⚠️ Repository Archived ⚠️

This repository has been archived and is no longer maintained.

Development for the IMAP server has been moved to the Stalwart Mail Server repository, where ongoing updates and improvements will take place.

Thank you for your interest and contributions!


Stalwart IMAP is an open-source Internet Message Access Protocol server designed to be secure, fast, robust and scalable.

Key features:

  • IMAP4 and ManageSieve server:
  • Multiple IMAP extensions supported:
  • JMAP support:
  • Flexible and scalable:
    • Pluggable storage backends with RocksDB, FoundationDB, PostgreSQL, mySQL, SQLite, S3-Compatible, Redis and ElasticSearch support.
    • Internal, LDAP and SQL database authentication.
    • Full-text search available in 17 languages.
    • Disk quotas.
    • Sieve scripting language with support for all registered extensions.
    • Email aliases, mailing lists, subaddressing and catch-all addresses support.
    • Integration with OpenTelemetry to enable monitoring, tracing, and performance analysis.
  • Secure and robust:
    • Encryption at rest with S/MIME or OpenPGP.
    • Built-in Spam and Phishing filter.
    • OAuth 2.0 authorization code and device authorization flows.
    • Access Control Lists (ACLs).
    • Rate limiting.
    • Memory safe (thanks to Rust).

Get Started

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

All documentation is available at stalw.art/docs/get-started.

Note If you need a more comprehensive solution that includes an SMTP server, you should consider installing the Stalwart Mail Server instead.

Support

If you are having problems running Stalwart IMAP, 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.

Funding

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!

License

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 licensing@stalw.art for more details.

Copyright

Copyright (C) 2023, Stalwart Labs Ltd.