Stalwart positions itself as an all-in-one mail and collaboration server rather than a single-purpose MTA or store. The project targets organizations and individuals who prefer to own their email infrastructure instead of renting it, and it bundles calendars, contacts and file sharing alongside conventional mail delivery.
The core feature set covers the protocols clients already use: JMAP, IMAP4, POP3 and SMTP for mail, plus CalDAV, CardDAV and WebDAV for calendars, contacts and files. Spam and phishing protection is included rather than bolted on, and the server is written in Rust with an emphasis on security, scalability and operational simplicity. Deployment options include Linux, macOS, Windows and Docker.
Editions are split into Enterprise and Community tiers, with a comparison and pricing page available for teams weighing support and scale requirements. Documentation covers installation, configuration, management, storage, access control, encryption, clustering and telemetry, so operators can plan a production rollout.
Prospective users should start with the installation guide for their platform, then review access control and encryption settings before migrating accounts. Those moving from an existing provider can consult the migration resources, while managed email is offered as an alternative for teams that would rather not run servers themselves.
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