mixandClaude Opus 5.5
50fd6b859f
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>
120 lines
5.6 KiB
Markdown
120 lines
5.6 KiB
Markdown
# Plan: panel-notifications
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**Status:** agreed 2026-10-12 - the design questions were closed with the owner and he took it into work ("Делаем")
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**Date:** 2026-10-12
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**Version:** `2.3.0` MINOR (one migration; opt-out by a switch).
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---
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## Goal
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The panel writes to its administrators when something needs them, instead of
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waiting to be opened.
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## Decisions (owner, 2026-10-12)
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### Events of the first version
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Four, each of them something the panel can already tell and a person has to
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act on:
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| Event | Who is told |
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|---|---|
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| A sending domain's DNS record stopped matching (SPF, DKIM, DMARC) | global users, and `domain` users the domain is assigned to |
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| A level-2 rate limit refused mail | the same, for the domain of the limit |
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| The TLS certificate is about to expire | global users |
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| A message has been in the queue for more than **three days** | global users |
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Three days, not one (owner: "one day is not that much"): Postfix keeps a
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message five, so two are left to act before it bounces. The threshold is a
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constant, not a setting.
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Left for later: a process or milter socket down (a relay in that state often
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cannot send), an inbound upstream unreachable, DMARC failures appearing
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(noisy). Mail held in quarantine is not an event: quarantine is an idea
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outside the roadmap.
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### Sender and path
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From `postmaster@<SELFPOST_HOSTNAME>`, submitted locally. Not from one of the
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sending domains (owner): with several domains the choice is arbitrary, and a
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message about the certificate has no business coming from a domain.
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These messages have to arrive (owner: "we need the best deliverability for
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them"), so the server's own name gets what a sending domain has:
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- a **DKIM key for the hostname**, generated by the panel, with which
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notifications are signed - no domain has to be chosen for it. An SPF record
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alone would pass DMARC, but not after the user's mailbox forwards the
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message on, and large receivers treat unsigned mail more strictly;
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- an **SPF record** for the hostname, `v=spf1 a -all`.
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The records themselves are under **Server › Settings** (owner: "the DNS
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records go to Settings, Health has only the status"), in a box of their own
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drawn with the record component of a domain's DNS page: host, value to
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publish, copy buttons, state. **Server › Health** has a card of its own,
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*Notification mail*, with the state of each record and a link to Settings.
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A DMARC record for the hostname is not asked for: the name inherits its
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parent domain's policy, and with SPF and DKIM aligned it passes any.
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Without the records notifications are still sent, and the card warns.
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Notifications are the panel's own mail: they are not rows of the Outbound log
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and count against no level-2 limit.
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A relay that cannot send cannot say so; none of the four events is "the relay
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is down", and that is why.
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### Who chooses what
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- One switch for the instance under **Server › Settings**.
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- One checkbox per user under **Account**, "send me notifications" - on when
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the profile has an e-mail. No choice per event: four events, none of them
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noise. Per-event choice comes when there are more and some are.
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- A user without an e-mail gets nothing.
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### When a message is sent
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A background check once an hour for DNS, certificate and queue.
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| Event | Sent | "Cleared" message |
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|---|---|---|
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| DNS mismatch | after two checks in a row found it (it has held for an hour). A resolver that did not answer is not a mismatch | after two good checks in a row |
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| Certificate | 14 days before expiry, and again 3 days before if it is still the same certificate | none |
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| Level-2 limit refused mail | at the first refusal for a domain or application, then at most once a day for the same limit | none |
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| Queue older than three days | when such a message appears | one, when none is left |
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Event state is kept in the database, so a restart announces nothing a second
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time.
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## To settle while building
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- How the panel submits: `sendmail` as the unprivileged panel user, and what
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that needs of the image.
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- Whether a notification carries a link to the panel - there is no setting
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for the panel's own address.
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- Where the refusal of a level-2 limit is noticed: in the journal milter as
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it refuses, or from the `rejected` rows of the send log on the hourly check.
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- Schema: the user's checkbox, the instance switch, the event state table.
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## Screens
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Not drawn. The Notifications box was taken out of the `account` and
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`settings` mockups on 2026-10-10 (owner: 2.0 ships no box for a feature that
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is not built). Drawing them again - one checkbox on Account, one switch on
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Server › Settings, the SPF check on Server › Health - is the first step, shown
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to the owner before any code ([panel-redesign.md](panel-redesign.md)
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§ Enforcement).
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## Implementation checklist
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- [x] Mockups: Account checkbox, Settings switch and records, Health status card, help topic; accepted by the owner 2026-10-12 (`design:` commit)
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- [x] Migration and store: user flag, instance switch, event state
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- [x] Sending: local submission from `postmaster@<hostname>`, message text (`sendmail` as the panel user; signed through `non_smtpd_milters` with a key of the server's own name; no link in the text - the panel does not know its own address)
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- [x] Background checker: DNS, certificate, queue; the rules of *When a message is sent*
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- [x] Level-2 refusal event (from the `rejected` rows of the send log, looked at every five minutes)
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- [ ] Panel: Account, Settings, Health check, help
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- [ ] guide.md, architecture.md, security.md, schema-migrations.md
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- [ ] `go vet`, `go test`, e2e: an event reaches a mailbox once and clears once
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- [ ] Technical review
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- [ ] Security review
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