The trace index task wrote the event type (its name) and the queue id as text, but the tracing search index types both as integers on every backend: BIGINT on PostgreSQL and MySQL, long on Elasticsearch. On PostgreSQL every batch holding a trace document failed with "cannot convert between the Rust type String and the Postgres type int8", and since a batch writes trace and email documents together, email indexing stalled behind it. The document is now built by trace_search_document(), which writes: - the event type as the opening event's numeric id, the event x:Trace/query's event filter already matches on; - the queue id as an integer, the first one the trace names; - every queue id into the keywords as well, since the column holds one value and an SMTP session can queue several messages. index_keyword() replaced the field on every call, so before this only the last event type and queue id survived anyway. x:Trace/query's queueId filter parses the id (a string, or now a number) and matches the column or the keywords, so a session is found by any of its queue ids on every backend. The monitoring spec says what is indexed. Traces indexed before this on the built-in index keep their text values; the reindexTelemetry maintenance task rebuilds them. Tests: the search store suite builds trace documents with the index task's code, indexes them and finds them by queue id, event type and keyword (Sqlite, PostgreSQL, MySQL); the monitoring suite finds a real trace by queueId through x:Trace/query.
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.