Today we are launching support.stalw.art, the new home for Stalwart community and Enterprise support. The portal consolidates the conversations that until now were scattered across GitHub Discussions, Discord, Matrix, and Reddit into a single, searchable place, so that questions can be found, answered, and revisited without depending on any one third-party platform.
After more than three months of focused work, we are thrilled to announce the release of Stalwart v0.16. This is easily the most ambitious release we have ever shipped, with literally hundreds of new features, improvements, and fixes across every corner of the server.
We will be upfront about something: v0.16 will feel like a new product on first contact. Several long-standing concepts have been reworked, a few have been removed, and many new ones have been introduced. This was a deliberate choice. Stalwart has been under continuous development for nearly five years, and both the feature set and the user base have grown far beyond what the original configuration and management layer was designed for. Rather than keep patching around those limits, we took the opportunity to rebuild the foundation. The payoff is a much cleaner architecture and a long list of features that were simply not implementable before, many of which had been sitting on the community wishlist for years.
Let’s walk through the highlights.
In professional cycling, the concept of marginal gains became famous through Team Sky. Rather than chasing dramatic breakthroughs, they focused on making hundreds of small improvements: slightly better bike fit, marginally lighter components, improved sleep, cleaner nutrition. None of these changes mattered much on their own, but together they reshaped performance—and helped dominate the sport for years.
Software systems, especially large distributed ones, work much the same way. Rarely does a single feature transform everything overnight. More often, real progress comes from careful attention to small details: shaving latency here, reducing contention there, simplifying a hot path, rethinking a data structure.
Stalwart v0.15 is very much a release in this spirit. It does not introduce a long list of headline features. Instead, it is the result of revisiting core subsystems—spam filtering, search, storage, and data access—and making many targeted improvements that, together, have a significant impact on performance, reliability, and usability.
After four years of development, we’re thrilled to announce a major milestone in the evolution of Stalwart — the full implementation of JMAP for Calendars, Contacts, File Storage, and Sharing. With this release, Stalwart becomes the first JMAP server to fully support the entire family of JMAP collaboration protocols, marking a new era for open, efficient, and elegant groupware.
At Stalwart Labs, security is at the heart of everything we build. As part of our ongoing commitment to delivering a trustworthy email and collaboration server, we recently completed our second independent security audit, conducted by Radically Open Security. Our previous audit took place exactly two years ago, in 2023 — and with significant changes to our codebase since then, a fresh and thorough assessment was essential.
