Dev tools · September 19, 2022
Distributed JMAP and IMAP Servers in Rust
I am happy to announce Stalwart JMAP [1], an open-source JSON Meta Application Protocol server that aims to be scalable, robust and secure. Some of its key features are: - JMAP Core, JMAP Mail and JMAP over WebSocket full compliance. - IMAP4 rev2/1 support via Stalwart IMAP, an imap-to-jmap proxy [2]. - Scalable and fault tolerant: consensus over Raft, node autodiscovery over gossip and read-only replicas. - RocksDB backend with full-text search support in 17 languages. - OAuth 2.0 authorization code and device authorization flows. - Domain Keys Identified Mail (DKIM) message signing. -…
In plain words
Stalwart JMAP is an open-source email server written in Rust that implements JMAP and IMAP4 protocols. It supports scalable, fault-tolerant deployments using Raft consensus and includes features like full-text search in 17 languages, OAuth 2.0 flows, and DKIM signing. The server runs without external dependencies and is designed for self-hosting scenarios, with plans for an SMTP component.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
I am happy to announce Stalwart JMAP [1], an open-source JSON Meta Application Protocol server that aims to be scalable, robust and secure. Some of its key features are: - JMAP Core, JMAP Mail and JMAP over WebSocket full compliance. - IMAP4 rev2/1 support via Stalwart IMAP, an imap-to-jmap proxy [2]. - Scalable and fault tolerant: consensus over Raft, node autodiscovery over gossip and read-only replicas. - RocksDB backend with full-text search support in 17 languages. - OAuth 2.0 authorization code and device authorization flows. - Domain Keys Identified Mail (DKIM) message signing. - Written in Rust. - No third-party software required to run or scale. The next item on the roadmap is to release an SMTP server in Rust with the goal of making self-hosting an e-mail server much simpler. Any comments or suggestions are more than welcome! [1]: https://github.com/stalwartlabs/jmap-server [2]: https://github.com/stalwartlabs/imap-server
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