Distributed JMAP and IMAP Servers in Rust

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

Stalwart JMAP server. Contribute to stalwartlabs/jmap-server development by creating an account on GitHub.

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…

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  Stalwart JMAP/IMAP Server2022 · stalw.art · ▲2

  Distributed JMAP and IMAP server written in Rust.

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