Stalwart

Self-host

All-in-one mail and collaboration server written in Rust, ships as a single binary.

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Category: Email · Self-host
Cost: Self-host
Country: UK
Licensing: Mixed

Pros and cons

+ what works

+Single Rust binary covers SMTP, IMAP, JMAP, POP3, CalDAV, CardDAV, and WebDAV
+Built-in DKIM, SPF, DMARC, ARC, Sieve, and ML-based spam filtering, no Rspamd glue work
+Pluggable storage backends (RocksDB, PostgreSQL, MySQL, S3, Azure, Redis)
+Modern codebase avoids the Postfix plus Dovecot plus SOGo integration burden

− watch out for

−Running mail in production is a real operational commitment
−Younger and less battle-tested than Postfix or Dovecot in large deployments
−Several features (multi-tenancy, OIDC/SAML, LLM spam, custom branding) are Enterprise-only
−Dual licensing means commercial use outside AGPLv3 terms requires a paid SELv1 license

Privacy notes

Self-hosting Stalwart keeps mail, calendars, contacts, and files on infrastructure you control. The Community edition makes no telemetry calls home. Operational privacy depends on the operator hardening the host, managing TLS, configuring DKIM, SPF, and DMARC, and handling backups. Stalwart Labs Ltd is registered in London, UK, but the company only receives data from operators who choose to engage with paid support or the Enterprise edition.

Does this work for you?

Notes from people who tried it

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