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https://github.com/stalwartlabs/imap-server

Stalwart IMAP server
https://github.com/stalwartlabs/imap-server

imap imap-server imap4 imap4rev1 imap4rev2

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Stalwart IMAP server

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README 

        
# ⚠️ 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**This repository has been archived and is no longer maintained.**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](https://github.com/stalwartlabs/mail-server), 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:

  - IMAP4rev2 ([RFC 9051](https://datatracker.ietf.org/doc/html/rfc9051)) full compliance.

  - IMAP4rev1 ([RFC 3501](https://datatracker.ietf.org/doc/html/rfc3501)) backwards compatible.

  - ManageSieve ([RFC 5804](https://datatracker.ietf.org/doc/html/rfc5804)) server with support for [all extensions](https://www.iana.org/assignments/sieve-extensions/sieve-extensions.xhtml).

- Multiple IMAP extensions supported:

  - Access Control Lists (ACL) ([RFC 4314](https://datatracker.ietf.org/doc/html/rfc4314))

  - Conditional Store and Quick Resynchronization ([RFC 7162](https://datatracker.ietf.org/doc/html/rfc7162))

  - SORT and THREAD ([RFC 5256](https://datatracker.ietf.org/doc/html/rfc5256))

  - Message Preview Generation ([RFC 8970](https://datatracker.ietf.org/doc/html/rfc8970))

  - And [many other extensions](https://stalw.art/docs/development/rfcs#imap4-and-extensions)...

- JMAP support:

  - JMAP Core ([RFC 8620](https://datatracker.ietf.org/doc/html/rfc8620))

  - JMAP Mail ([RFC 8621](https://datatracker.ietf.org/doc/html/rfc8621))

  - JMAP over WebSocket ([RFC 8887](https://datatracker.ietf.org/doc/html/rfc8887))

  - JMAP for Sieve Scripts ([DRAFT-SIEVE-13](https://www.ietf.org/archive/id/draft-ietf-jmap-sieve-13.html))

- 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](https://www.iana.org/assignments/sieve-extensions/sieve-extensions.xhtml).

  - 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](https://www.rfc-editor.org/rfc/rfc8628) and [device authorization](https://www.rfc-editor.org/rfc/rfc8628) 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:



- [Linux / MacOS](https://stalw.art/docs/install/linux)

- [Windows](https://stalw.art/docs/install/windows)

- [Docker](https://stalw.art/docs/install/docker)



All documentation is available at [stalw.art/docs/get-started](https://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](https://github.com/stalwartlabs/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](https://github.com/stalwartlabs/imap-server/discussions),

[Reddit](https://www.reddit.com/r/stalwartlabs) or [Discord](https://discord.gg/jVAuShSdNZ).

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](https://nlnet.nl/entrust), a fund established by [NLnet](https://nlnet.nl/) with financial support from the European Commission's [Next Generation Internet](https://ngi.eu/) 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](https://liberapay.com/stalwartlabs). Thank you!



## License



Licensed under the terms of the [GNU Affero General Public License](https://www.gnu.org/licenses/agpl-3.0.en.html) as published by

the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

See [LICENSE](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



Copyright (C) 2023, Stalwart Labs Ltd.