Show this Postfix's retry policy on Mail queue and delivery history.

Numbers come from a one-shot postconf -h at panel start so a manual override is visible after restart, without inventing an attempt count.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/postfix/retry_test.go

@@ -0,0 +1,79 @@
+package postfix
+
+import (
+	"errors"
+	"testing"
+	"time"
+)
+
+func TestLoadRetryPolicyUsesPostconfValues(t *testing.T) {
+	old := readRetryConf
+	readRetryConf = func() ([]string, error) {
+		return []string{"300s", "300s", "4000s", "2d", "5d", "0"}, nil
+	}
+	t.Cleanup(func() { readRetryConf = old })
+
+	p := LoadRetryPolicy()
+	if p.FromDefaults {
+		t.Fatal("FromDefaults = true, want live postconf values")
+	}
+	if p.MinimalBackoff != 300*time.Second {
+		t.Errorf("MinimalBackoff = %v, want 300s", p.MinimalBackoff)
+	}
+	if p.MaximalBackoff != 4000*time.Second {
+		t.Errorf("MaximalBackoff = %v, want 4000s", p.MaximalBackoff)
+	}
+	if p.MaximalQueueLifetime != 2*24*time.Hour {
+		t.Errorf("MaximalQueueLifetime = %v, want 2d", p.MaximalQueueLifetime)
+	}
+	if p.BounceQueueLifetime != 5*24*time.Hour {
+		t.Errorf("BounceQueueLifetime = %v, want 5d", p.BounceQueueLifetime)
+	}
+	if p.DelayWarningTime != 0 {
+		t.Errorf("DelayWarningTime = %v, want 0", p.DelayWarningTime)
+	}
+}
+
+func TestLoadRetryPolicyFallsBackWhenPostconfFails(t *testing.T) {
+	old := readRetryConf
+	readRetryConf = func() ([]string, error) {
+		return nil, errors.New("exec: not found")
+	}
+	t.Cleanup(func() { readRetryConf = old })
+
+	p := LoadRetryPolicy()
+	want := DefaultRetryPolicy()
+	if !p.FromDefaults {
+		t.Error("FromDefaults = false, want true when postconf fails")
+	}
+	if p.QueueRunDelay != want.QueueRunDelay || p.MinimalBackoff != want.MinimalBackoff ||
+		p.MaximalBackoff != want.MaximalBackoff || p.MaximalQueueLifetime != want.MaximalQueueLifetime {
+		t.Errorf("fallback = %+v, want compiled-in defaults %+v", p, want)
+	}
+}
+
+func TestLoadRetryPolicyFallsBackOnUnparseableValues(t *testing.T) {
+	old := readRetryConf
+	readRetryConf = func() ([]string, error) {
+		return []string{"300s", "nope", "4000s", "5d", "5d", "0"}, nil
+	}
+	t.Cleanup(func() { readRetryConf = old })
+
+	p := LoadRetryPolicy()
+	if !p.FromDefaults {
+		t.Error("FromDefaults = false, want true when a value cannot be parsed")
+	}
+}
+
+func TestParseRetryPolicyStock(t *testing.T) {
+	p, err := parseRetryPolicy([]string{"300s", "300s", "4000s", "5d", "5d", "0"})
+	if err != nil {
+		t.Fatalf("parseRetryPolicy: %v", err)
+	}
+	if p.FromDefaults {
+		t.Error("parsed policy should not be marked FromDefaults")
+	}
+	if p.QueueRunDelay != 300*time.Second || p.MaximalQueueLifetime != 5*24*time.Hour {
+		t.Errorf("parsed = %+v", p)
+	}
+}