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Rewrite as a Rust, Apache-2.0 workspace

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Supersedes the Go + embed-Mox design. The Go tree is removed; its
architecture doc is preserved at docs/archive/ARCHITECTURE-go-embed-mox.md
because its competitive analysis and data model still hold.

Five decisions recorded as ADRs:

  0001  Rust, not Go — accepting ~5,500 lines of protocol code that Mox
        would have given us free, to get the first permissively licensed
        Rust mail server. Costs stated plainly.
  0002  Apache-2.0, not MIT or AGPL — patent grant, trademark, CLA-free
        contribution. Public on GitHub; Gitea stays as the private fallback.
  0003  Stalwart's primitive crates (Apache-2.0/MIT) yes; its AGPL server
        crates never. DANE and MTA-STS sit on the AGPL side of that line,
        which is why we write our own.
  0004  Milestones, reordered: embedded inbound is required at launch.
  0005  Oracle Cloud blocks outbound :25, so direct-to-MX is impossible on
        the launch host. Split delivery is mandatory, not an on-ramp.

Twelve crates in three tiers. Tier 1 (mail-dane, mail-mta-sts, mail-dsn)
is standalone and publishable — no `dane` or `mta-sts` crate exists on
crates.io at all today.

openmail-relay ships the provider table as data, with SES and Oracle from
the start. Oracle's and Resend's SPF includes are deliberately None: a
guessed include turns the DNS check green against a mechanism the provider
does not honour, and mail still fails SPF silently.

cargo check/test/clippy/fmt all green; unsafe_code is forbidden workspace
wide; cargo-deny enforces the licence policy in CI.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JkyvfNJGTshJNE9FtwPLk7
This commit is contained in:
Karti Tripathi
2026-09-02 13:08:05 -07:00
co-authored by Claude Opus 5
parent 428040d964
commit 36b15ddcaf
59 changed files with 5540 additions and 1762 deletions
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OpenMail
Copyright 2026 Karti Tripathi
This product includes software developed at OpenMail (https://openmail.karti.ai).
Licensed under the Apache License, Version 2.0 (the "License"); you may not use
this software except in compliance with the License. You may obtain a copy of
the License at
http://www.apache.org/licenses/LICENSE-2.0
------------------------------------------------------------------------------
Third-party dependencies
------------------------------------------------------------------------------
OpenMail links the following third-party Rust crates. All are used under
permissive licenses compatible with Apache-2.0. No GPL, LGPL, or AGPL code is
linked into any OpenMail binary or library.
mail-parser Apache-2.0 OR MIT Stalwart Labs MIME parsing
mail-builder Apache-2.0 OR MIT Stalwart Labs RFC 5322 construction
mail-auth Apache-2.0 OR MIT Stalwart Labs DKIM / SPF / DMARC / ARC
smtp-proto Apache-2.0 OR MIT Stalwart Labs SMTP wire protocol
hickory-resolver Apache-2.0 OR MIT Hickory DNS DNS + DNSSEC
OpenMail does NOT incorporate any code from the Stalwart mail server itself
(crates/* in stalwartlabs/stalwart), which is AGPL-3.0-only OR LicenseRef-SEL.
Only the separately published, permissively licensed primitive crates above are
used. See docs/adr/0003-own-crates.md.