refused messages: the page shows what Postfix wrote (stage 2b, 0009)

The Delivery log box of every refused row said "This message never reached
the queue, so Postfix wrote no delivery lines for it" - untrue: Postfix
wrote a line for each. The owner, 2026-10-13: the box is required on every
message page. Pictured for him first (dev/shots, the refused variant of
out-message: wrong From with its queue id lines, rate-limited with the
NOQUEUE line); the variant has no mockup screen of its own - the guard ties
screens to pages, and its outline is out-message's.

- Wrong From: cleanup gives the message a queue id before the headers are
  judged; the sender check reads {i} at end-of-headers and writes it on the
  refused row. Its lines - stored under the id like any other's - are on the
  page, but only those from 10 minutes before to 1 minute after the refusal
  (store.SendLogLines for a rejected row): Postfix frees the id at once, and
  a later message with it lends nothing. No mail.log fallback for a refused
  row, for the same reason.
- Rate-limited and wrong client: refused at MAIL FROM, no queue id. Migration
  0009 adds send_log.refusal_line; logtail.refusalLines matches smtpd's
  "NOQUEUE: milter-reject: MAIL from ...; from=<...>" (not port 25's, not
  CONNECT/EHLO) and store.AttachRefusalLine puts it on the newest refused row
  of that sender (and login, when the line names it) within two minutes; a
  line whose row is not written yet waits up to 30 s (retried at each pass).
- The page: the queue id fact says "given, the message was not queued" or
  "none - refused at MAIL FROM, before one is given"; the box's caption is
  "The line from mail.log for this refusal" for the latter; a row from
  before says the line was not kept. LogLineLevel colours a refusal by its
  reply: 5xx red, 4xx amber (IPv6 clients included). The id in the fact is
  not muted as in the picture: the kit has no muted inline.

Tests: store (attach by sender, login, time; not a queued row, not one an
hour off; a refused row's lines are its own minutes); logtail (attach, wait
and retry, port 25 and other lines ignored); milter (the refused row carries
{i}); view (facts, caption, line levels); handlers (the line on the page,
the sentence without it). e2e refusals_show_postfixs_line: a client-address
refusal made there, and the pages of a wrong From, a rate-limited and a
wrong client refusal each show Postfix's line.

schema-migrations row 9, CHANGELOG [Unreleased], audit plan line ticked,
roadmap 25/62.
Evidence on the test server for this tree: make e2e exit 0 (the new case
in 5.4 s); go test ./... ok but for two schema tests, fixed after the run
(the schema at 0009) - store tests ok locally; the full run follows before
the push.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/store/refusal_test.go

@@ -0,0 +1,79 @@
+package store
+
+import (
+	"testing"
+	"time"
+)
+
+// Postfix's line about a refusal at MAIL FROM goes on the row of that sender
+// and login refused about then, the newest without a line; a queued row, a
+// row of another sender and a row from long ago are not it (audit
+// 2026-10-12, stage 2b).
+func TestAttachRefusalLine(t *testing.T) {
+	st := openTestStore(t)
+	now := time.Now().UTC()
+	for _, e := range []SendLogEntry{
+		{AppLogin: "l2app", From: "billing@example.com", Reason: ReasonLimit},
+		{AppLogin: "l2app", From: "other@example.com", Reason: ReasonLimit},
+	} {
+		if err := st.InsertRejected(e); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if err := st.InsertQueued(SendLogEntry{QueueID: "Q1", AppLogin: "l2app", From: "billing@example.com", To: "x@example.net"}); err != nil {
+		t.Fatal(err)
+	}
+	line := "Oct 14 12:00:00 mail postfix/smtpd[1]: NOQUEUE: milter-reject: MAIL from unknown[10.77.0.1]: 451 4.7.1 Service unavailable"
+	if ok, err := st.AttachRefusalLine("l2app", "Billing@example.com", now, line); err != nil || !ok {
+		t.Fatalf("attach = %v, %v", ok, err)
+	}
+	// The row has its line now; a second line finds no row without one.
+	if ok, _ := st.AttachRefusalLine("l2app", "billing@example.com", now, line); ok {
+		t.Fatal("a second line took a row that has one")
+	}
+	if ok, _ := st.AttachRefusalLine("l2app", "other@example.com", now.Add(-time.Hour), line); ok {
+		t.Fatal("a line an hour off took a row")
+	}
+	if ok, _ := st.AttachRefusalLine("someone", "other@example.com", now, line); ok {
+		t.Fatal("a line of another login took a row")
+	}
+	rows, _ := st.QuerySendLog(SendLogFilter{AllDomains: true}, 10, 0)
+	got := 0
+	for _, r := range rows {
+		full, _ := st.GetSendLog(r.ID)
+		if full.RefusalLine != "" {
+			got++
+			if full.From != "billing@example.com" || full.Status != StatusRejected {
+				t.Errorf("the line went to %+v", full)
+			}
+		}
+	}
+	if got != 1 {
+		t.Fatalf("%d rows have a line, want 1", got)
+	}
+}
+
+// A refused message's lines are those of a few minutes around the refusal:
+// its queue id was freed at once, and a later message with the same id lends
+// it nothing.
+func TestSendLogLinesOfARefusalAreItsOwn(t *testing.T) {
+	st := openTestStore(t)
+	if err := st.InsertRejected(SendLogEntry{QueueID: "7BCAF3C75DA0", AppLogin: "shop", From: "shop@shop.example", Reason: ReasonFrom}); err != nil {
+		t.Fatal(err)
+	}
+	now := time.Now().UTC()
+	if _, err := st.InsertSendLogLines([]SendLogLine{
+		{QueueID: "7BCAF3C75DA0", At: now.Add(-time.Second), Line: "its own refusal"},
+		{QueueID: "7BCAF3C75DA0", At: now.Add(20 * time.Minute), Line: "a later message with the id"},
+	}, false); err != nil {
+		t.Fatal(err)
+	}
+	rows, _ := st.QuerySendLog(SendLogFilter{AllDomains: true}, 1, 0)
+	lines, err := st.SendLogLines(rows[0], 5*24*time.Hour, 10)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(lines) != 1 || lines[0].Line != "its own refusal" {
+		t.Fatalf("lines = %+v, want its own alone", lines)
+	}
+}