Phase 2 of the personal-data catalog spec. resources/privacy/catalog.toml classifies every object in the schema (316) and inbuxa's own JMAP objects (12): each property that can hold personal data, with its categories, and for objects that hold any, whose data it is, where it lives, its scope and what bounds its retention (a named setting where there is one). Twenty sources that are no object -- the log file, exporters, webhooks, spam lookups, the Explain cache, relays and hooks, push, legacy-use records -- carry the same facts plus the settings that turn them on, whether the data leaves the host, and the code that writes it. Classifications of objects that hold data about people are from the spec's source map; the rest are typed from the schema alone (address, IP, secret). tools/fork/privacy-check.py fails CI when an object or inbuxa object has no entry, when a property the schema types as an address, IP or secret is left to its object's default, when an entry names an object, property, setting or code path that is gone, or when it uses a word outside the catalog's vocabulary. --unlisted prints starting entries. strip.py's report gains "Unclassified in the privacy catalog": objects and fields new in an import and not classified, informational like the Enterprise flags. Tested: 13 unit tests (tools/fork/tests): the check passes on this tree; fails on an unclassified object, an address hidden behind a default, a secret in a set or object reference, stale properties, objects, settings and code paths, an unlisted inbuxa object and a word outside the vocabulary; --unlisted's entries; and the strip report on a synthetic import. The check and the tests run in the fork-checks job.
A complete mail and collaboration server, every feature included, under the AGPL
inbuxa is a mail and collaboration server: JMAP, IMAP, POP3, SMTP, CalDAV, CardDAV and WebDAV, in one Rust binary, with ihasmail as its web front end. It is a fork of Stalwart. Project site: inbuxa.org. Documentation: docs.inbuxa.org.
Stalwart ships some features only in a paid Enterprise Edition: multi-tenancy, masked email, undelete and others. inbuxa ships everything to everybody under the AGPL-3.0, rebuilding those features independently and without using any of Stalwart's Enterprise code.
What's different from Stalwart
- Every feature, one edition. No license key, no edition checks, no
upsell. See
docs/spec/SPEC.md§4 for the features being rebuilt, anddocs/spec/features/for each one's specification. - Webmail and administration by ihasmail, as a separate service that can run beside the server or elsewhere. Stalwart's own web interface is removed, so there's no web front end on the mail host.
- Clean-room rebuilds. Enterprise-only code is stripped from every
upstream release before it's imported. The rebuilt features are written
from specifications that use only public sources (
docs/spec/SPEC.md§3).
How the fork is kept
Upstream releases arrive as stripped snapshots, never with upstream's git
history, which contains Enterprise code. tools/fork/strip.py builds each
snapshot on top of upstream's own ossify.py, then verifies it independently.
The report for every import is in docs/fork/strip-reports/. See
docs/spec/SPEC.md §2.
Building
cargo build --release -p inbuxa # the binary is target/release/inbuxa
docker build -t inbuxa . # or the container image
Settings are read from INBUXA_* environment variables. An existing Stalwart
install's STALWART_* variables aren't read: the server stops at startup and
names each one to rename.
New installs keep their data in /var/lib/inbuxa and logs in
/var/log/inbuxa. Existing installs keep the paths their configuration
already names, so none of their data moves.
License and credits
inbuxa is free software under the GNU Affero General Public License, version 3.
It is a fork of Stalwart, copyright © Stalwart Labs LLC, modified by Coffey Labs in 2026. Upstream's copyright notices are kept on every file they cover, and every upstream file this fork changed says so in its header, under the notice it came with. Stalwart's files are dual-licensed AGPL-3.0-only or Stalwart's Enterprise License, and inbuxa takes them under the AGPL-3.0 only. A few of those files also carry code from other projects under MIT or BSD licenses, which stays under those licenses; THIRD-PARTY.md lists it with its notices. "Stalwart" is Stalwart Labs' name. inbuxa isn't affiliated with or endorsed by Stalwart Labs.
The inbuxa mark reuses ihasmail's cat-and-envelope artwork.