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docs: panel-dkim-signing stage 3 - the documents without OpenDKIM
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architecture § OpenDKIM becomes § DKIM signing (keys, the selector table
and when it is rewritten, the two sockets, what is signed and the limits,
the old tree); the process table, start order, liveness, the mail-path
diagram, § Sender check, Persistence and the restore Resync follow the
code. security.md: the panel signs with the login's key, the keys are the
panel's alone, group selfpost and CAP_KILL as they are now; OpenDKIM's
accepted risks go; new ones: what sendmail(1) submits is signed as the
server, Sender: is signed but not judged (the owner's decision), and
go-milter keeps every header per session, so the signer's 1 MiB refusal
does not bound the library's copy. guide: Health, the container log's
dkim-signer lines, backups, the long-line limit, and upgrading to 2.8.0 -
with the rollback to 2.7.x: its start reads the queue as its own postfix
(uid 101) before it hands the queue over, so the hand-over by name is run
in the 2.7.x image first (measured on a copy of the test server's queue:
postsuper failed before, passed after). development, README, SECURITY,
product, the assumptions register's header: what left the image.
entrypoint.sh: a comment, the rollback note as the guide gives it. Plan
stage 3 lines ticked, roadmap 12/14.

Written by four agents, one document each, against a brief of what the
code does; reviewed here.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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2026-10-16 01:56:56 +03:00
co-authored by Claude Opus 5.5
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@@ -44,7 +44,7 @@ in `git log` and [CHANGELOG.md](../CHANGELOG.md).
| own-mta-builds | Analysis: build Postfix and OpenDKIM ourselves, patched, instead of Debian's packages | analysed 2026-10-15: no own builds; three rows proposed instead | — | [own-mta-builds-2026-10-15.md](own-mta-builds-2026-10-15.md) |
| port25-bare-newline | The inbound relay's port 25 refuses bare newlines in DATA (`smtpd_forbid_bare_newline=normalize`) | shipped `2.6.1` | — | — |
| base-trixie | The image's base from Debian bookworm (LTS since 2026-07-12) to trixie: Postfix 3.10 with the 2026 security batches | shipped `2.7.0` | — | — |
| panel-dkim-signing | DKIM signing in the panel's own milter; OpenDKIM, the syslog relay and the parser port removed | agreed (2026-10-15; stages 1-2 done) | 10/14 | [plans/panel-dkim-signing.md](plans/panel-dkim-signing.md) |
| panel-dkim-signing | DKIM signing in the panel's own milter; OpenDKIM, the syslog relay and the parser port removed | agreed (2026-10-15; stages 1-2 done, documents and reviews) | 12/14 | [plans/panel-dkim-signing.md](plans/panel-dkim-signing.md) |
| phone-desktop-mode | A phone browser in "desktop site" mode gets the phone navigation | agreed (2026-10-13: after stages 1 and 2 of audit-2026-10-12) | — | — |
| from-header-binding | Hold a message's `From:` header against the application that sends it | shipped `2.4.0` | 9/9 | [plans/from-header-binding.md](plans/from-header-binding.md) |
| panel-redesign | Panel redesign (accepted mockups, design contract) | shipped `2.0.0` | 27/27 | [plans/panel-redesign.md](plans/panel-redesign.md) |