The company behind Stalwart.
Stalwart Labs builds Stalwart, the open-source mail and collaboration server used by governments, universities, hosting providers, email service providers and enterprises of all sizes around the world.
A modern mail and collaboration server.
Stalwart is a single product that covers the mail and collaboration protocols end to end (JMAP, IMAP, POP3, SMTP, CalDAV, CardDAV and WebDAV), with a built-in spam and phishing filter and a configuration model that an administrator can read in one sitting. It is dual-licensed: a free Community edition under AGPL-3.0 and a commercial Enterprise edition that adds operational features for larger and multi-tenant deployments.
Replacing the legacy mail stack with one product.
Most mail-server stacks in production still combine three or four separate components, each with its own configuration language and operational quirks. We started Stalwart Labs in response to that slow-moving market: rather than gluing together yet another stack, we set out to build the mail and collaboration server we wished existed, with security as a default and clustering designed in from the start. Our goal is to make running modern email reliable, secure and affordable, whether the operator is a single sysadmin or a hosting platform with millions of mailboxes.
Young product, broad adoption.
Stalwart Labs was founded in July 2019. Work on the Stalwart server began in September 2021, and the first public release shipped in September 2022. Stalwart is the most-starred mail server project on GitHub, with tens of thousands of stars, tens of thousands of production servers running worldwide, and millions of licenses issued to date. The product is younger than the team behind it: the founder spent more than three decades building email and enterprise software before starting the company, and the design choices in Stalwart reflect that. Stalwart is used by governments, universities, hosting providers, email service providers and enterprises of all sizes; references are available on request.
A distributed team behind a global product.
Stalwart Labs is incorporated in both the United States and the United Kingdom. The team works remotely, distributed across multiple time zones, so support and development cover the hours our customers operate in. The combined experience behind the product spans email, security, large-scale storage and compliance, accumulated across decades of building enterprise software.
Where to find us.
Sheridan, WY 82801
London, EC1V 2NX