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panel-notifications: the notifier, its mail and the server's own DKIM key

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internal/notify applies the owner's rules. Each subject has a row of state,
so a thing is said once and a restart says nothing again:

- DNS of a sending domain: said after two hourly checks in a row found a
  record wrong, said to be over after two found it right. A lookup that did
  not answer moves nothing; a warning (no DMARC record) is not a subject.
- TLS certificate: at 14 days and at 3, per certificate.
- Queue: a message older than three days, once; once more when none is.
- Level-2 limit: from the rejected rows of the send log, every five minutes;
  at most once a day per domain and application.

Global users are told everything, domain users about their domains; one
message per recipient. With the instance switch off nothing is checked and no
state moves. A message that could not be handed to Postfix is tried again at
the next check.

Mail leaves by sendmail(1) as postmaster@<hostname>, addresses after "--",
no shell. For it to be believed the server's own name is signed like a
sending domain: domain.Service keeps a key for it and a line in OpenDKIM's
tables without a registry row, and non_smtpd_milters now names OpenDKIM. A
sending domain of the same name shares its key with the server.
dnscheck.ServerMail checks the name's DKIM and SPF records;
postfix.QueueMessages reads postqueue -j for arrival times.

The notifier is a sixth role of the panel process. Nothing in the panel
shows or switches it yet.

Checked on Windows: go vet clean; go test passes for notify, store, postfix,
dnscheck, cmd, and domain apart from TestWriteLoadPrivateKeyRoundtrip, which
fails there on file modes and always did. Not yet run in a container: whether
the unprivileged panel may submit is for the e2e step.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
mix
2026-10-12 15:56:13 +03:00
co-authored by Claude Opus 5.5
parent 06ad174fb9
commit 50fd6b859f
17 changed files with 1547 additions and 9 deletions
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docs/roadmap.md
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@@ -35,7 +35,7 @@ in `git log` and [CHANGELOG.md](../CHANGELOG.md).
| template-data-typing | Typed structs for template data instead of `map[string]any` | candidate | — | — |
| structured-logging | `log/slog` with levels and fields | candidate | — | — |
| review-2026-08-followups | Remaining findings of the 2026-08-19 code review | candidate | — | — |
| panel-notifications | E-mail notifications about important events | in progress | 2/10 | [plans/panel-notifications.md](plans/panel-notifications.md) |
| panel-notifications | E-mail notifications about important events | in progress | 5/10 | [plans/panel-notifications.md](plans/panel-notifications.md) |
| delivery-log-storage | Keep a message's `mail.log` lines with its send-log row | shipped `2.2.0` | 8/8 | [plans/delivery-log-storage.md](plans/delivery-log-storage.md) |
| password-reset | Password reset by e-mail | candidate | — | — |
| phone-desktop-mode | A phone browser in "desktop site" mode gets the phone navigation | candidate | — | — |