release: 1.6.0

Add 30-day send statistics and auto level-2 rate limits on the domain page. Close Unreleased; pin compose and docs to 1.6.0.

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

internal/web/handlers/handlers_apps.go

@@ -6,6 +6,7 @@ import (
 	"net/http"
 	"strconv"
 	"strings"
+	"time"
 
 	"github.com/mixeme/selfpost/internal/dnscheck"
 	"github.com/mixeme/selfpost/internal/domain"
@@ -43,10 +44,22 @@ type detailView struct {
 // template fields (Login, AddressMode, Addresses, ID) resolve unchanged.
 type appRateLimitView struct {
 	store.Application
-	HasLimit  bool   // an active limit is configured
-	IPsText   string // allowed IPs, newline-joined for the textarea
-	MaxText   string // message ceiling, blank when unset
-	WindowVal string // window seconds, defaulted when unset
+	HasLimit       bool
+	IPsText        string
+	MaxText        string
+	WindowVal      string
+	Mode           string
+	AutoMultiplier string
+	AutoUpdated    string
+	IsAuto         bool
+	Stats          sendStatsView
+}
+
+// sendStatsView is the template-facing send statistics block.
+type sendStatsView struct {
+	Total       int64
+	PeakPerHour int64
+	AvgPerHour  string
 }
 
 // HandleDomainDetail shows a single domain: its DKIM DNS record (product.md)
@@ -77,6 +90,7 @@ func (h *Handlers) renderDomainDetail(w http.ResponseWriter, r *http.Request, st
 		return
 	}
 	appViews := make([]appRateLimitView, 0, len(apps))
+	retention := h.sendLogRetentionDays()
 	for _, a := range apps {
 		rl, ok, err := h.apps.RateLimit(a.ID)
 		if err != nil {
@@ -84,12 +98,31 @@ func (h *Handlers) renderDomainDetail(w http.ResponseWriter, r *http.Request, st
 			http.Error(w, "internal error", http.StatusInternalServerError)
 			return
 		}
+		appStats, err := h.store.AppSendStats(a.Login, retention, a.CreatedAt)
+		if err != nil {
+			logf("panel: application %d: send stats: %v", a.ID, err)
+			http.Error(w, "internal error", http.StatusInternalServerError)
+			return
+		}
+		mode := store.RateLimitModeManual
+		if ok && rl.Mode != "" {
+			mode = rl.Mode
+		}
+		mult := rl.AutoMultiplier
+		if mult <= 0 {
+			mult = store.DefaultAutoMultiplier
+		}
 		appViews = append(appViews, appRateLimitView{
-			Application: a,
-			HasLimit:    ok && rl.Active(),
-			IPsText:     strings.Join(rl.AllowedIPs, "\n"),
-			MaxText:     intOrBlank(rl.MaxMessages),
-			WindowVal:   windowOrDefault(rl.WindowSeconds),
+			Application:    a,
+			HasLimit:       ok && rl.Active(),
+			IPsText:        strings.Join(rl.AllowedIPs, "\n"),
+			MaxText:        intOrBlank(rl.MaxMessages),
+			WindowVal:      windowOrDefault(rl.WindowSeconds),
+			Mode:           mode,
+			AutoMultiplier: formatMultiplier(mult),
+			IsAuto:         ok && rl.IsAuto(),
+			AutoUpdated:    formatAutoUpdated(rl.AutoUpdatedAt),
+			Stats:          formatSendStats(appStats),
 		})
 	}
 
@@ -99,6 +132,22 @@ func (h *Handlers) renderDomainDetail(w http.ResponseWriter, r *http.Request, st
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
 	}
+	domainStats, err := h.store.DomainSendStats(d.Name, retention, d.CreatedAt)
+	if err != nil {
+		logf("panel: domain %d: send stats: %v", d.ID, err)
+		http.Error(w, "internal error", http.StatusInternalServerError)
+		return
+	}
+	domainMode := store.RateLimitModeManual
+	domainMult := store.DefaultAutoMultiplier
+	if domainRLok {
+		if domainRL.Mode != "" {
+			domainMode = domainRL.Mode
+		}
+		if domainRL.AutoMultiplier > 0 {
+			domainMult = domainRL.AutoMultiplier
+		}
+	}
 
 	// What DNS actually publishes for the domain today, checked against the key
 	// this server signs with. Cached by the checker, so re-rendering the page
@@ -168,8 +217,18 @@ func (h *Handlers) renderDomainDetail(w http.ResponseWriter, r *http.Request, st
 	data["DomainRLMax"] = intOrBlank(domainRL.MaxMessages)
 	data["DomainRLWin"] = windowOrDefault(domainRL.WindowSeconds)
 	data["DomainRLMaxNum"] = domainRL.MaxMessages
+	data["DomainRLMode"] = domainMode
+	data["DomainRLAuto"] = domainRLok && domainRL.IsAuto()
+	data["DomainRLMultiplier"] = formatMultiplier(domainMult)
+	data["DomainRLAutoUpdated"] = formatAutoUpdated(domainRL.AutoUpdatedAt)
+	data["DomainStats"] = formatSendStats(domainStats)
+	data["StatsWindowDays"] = domainStats.WindowDays
+	data["StatsRetentionWarning"] = retention < store.StatsWindowDays
 	data["L1Messages"] = h.l1Messages()
 	data["L1Window"] = h.l1Window()
+	data["DefaultAutoMultiplier"] = store.DefaultAutoMultiplier
+	data["MinAutoMultiplier"] = store.MinAutoMultiplier
+	data["MaxAutoMultiplier"] = store.MaxAutoMultiplier
 	h.view.Render(w, status, "domain_detail", data)
 }
 
@@ -232,6 +291,25 @@ func windowOrDefault(n int) string {
 	return strconv.Itoa(n)
 }
 
+func formatSendStats(s store.SendStats) sendStatsView {
+	return sendStatsView{
+		Total:       s.Total,
+		PeakPerHour: s.PeakPerHour,
+		AvgPerHour:  fmt.Sprintf("%.1f", s.AvgPerHour),
+	}
+}
+
+func formatMultiplier(v float64) string {
+	return strconv.FormatFloat(v, 'f', 1, 64)
+}
+
+func formatAutoUpdated(t time.Time) string {
+	if t.IsZero() {
+		return ""
+	}
+	return t.UTC().Format("2006-01-02 15:04 UTC")
+}
+
 // detailFlash maps a fixed redirect flag to a fixed message, so status text
 // after a redirect is never attacker-influenced.
 func detailFlash(r *http.Request) string {
@@ -242,6 +320,8 @@ func detailFlash(r *http.Request) string {
 		return "Application address mode updated."
 	case r.URL.Query().Get("ratelimit") != "":
 		return "Rate limit updated."
+	case r.URL.Query().Get("recalculated") != "":
+		return "Auto rate limit recalculated."
 	case r.URL.Query().Get("dmarc") != "":
 		return "DMARC report settings updated."
 	case r.URL.Query().Get("imported") != "":

internal/web/handlers/handlers_ratelimit.go

@@ -13,10 +13,12 @@ import (
 const defaultRateLimitWindowSeconds = 3600
 
 type rateLimitInput struct {
-	clear         bool
-	ips           []string
-	maxMessages   int
-	windowSeconds int
+	clear          bool
+	mode           string
+	ips            []string
+	maxMessages    int
+	windowSeconds  int
+	autoMultiplier float64
 }
 
 func (h *Handlers) l1Messages() int {
@@ -33,6 +35,32 @@ func (h *Handlers) l1Window() int {
 	return defaultRateLimitWindowSeconds
 }
 
+func parseAutoMultiplier(raw string) (float64, error) {
+	raw = strings.TrimSpace(raw)
+	if raw == "" {
+		return store.DefaultAutoMultiplier, nil
+	}
+	v, err := strconv.ParseFloat(raw, 64)
+	if err != nil {
+		return 0, fmt.Errorf("enter a valid multiplier (%.1f–%.1f)", store.MinAutoMultiplier, store.MaxAutoMultiplier)
+	}
+	if v < store.MinAutoMultiplier || v > store.MaxAutoMultiplier {
+		return 0, fmt.Errorf("multiplier must be between %.1f and %.1f", store.MinAutoMultiplier, store.MaxAutoMultiplier)
+	}
+	return v, nil
+}
+
+func parseRateLimitMode(raw string) (string, error) {
+	raw = strings.TrimSpace(raw)
+	if raw == "" {
+		return store.RateLimitModeManual, nil
+	}
+	if raw != store.RateLimitModeManual && raw != store.RateLimitModeAuto {
+		return "", fmt.Errorf("choose manual or auto mode")
+	}
+	return raw, nil
+}
+
 func parseDomainRateLimitForm(r *http.Request, l1Max int) (rateLimitInput, error) {
 	if err := r.ParseForm(); err != nil {
 		return rateLimitInput{}, fmt.Errorf("invalid form submission")
@@ -40,6 +68,18 @@ func parseDomainRateLimitForm(r *http.Request, l1Max int) (rateLimitInput, error
 	if r.PostFormValue("clear") != "" {
 		return rateLimitInput{clear: true}, nil
 	}
+	mode, err := parseRateLimitMode(r.PostFormValue("mode"))
+	if err != nil {
+		return rateLimitInput{}, err
+	}
+	if mode == store.RateLimitModeAuto {
+		mult, err := parseAutoMultiplier(r.PostFormValue("auto_multiplier"))
+		if err != nil {
+			return rateLimitInput{}, err
+		}
+		return rateLimitInput{mode: mode, autoMultiplier: mult}, nil
+	}
+
 	rawMax := strings.TrimSpace(r.PostFormValue("max_messages"))
 	if rawMax == "" {
 		return rateLimitInput{clear: true}, nil
@@ -55,7 +95,7 @@ func parseDomainRateLimitForm(r *http.Request, l1Max int) (rateLimitInput, error
 	if err != nil || windowSeconds <= 0 {
 		return rateLimitInput{}, fmt.Errorf("enter a time window greater than zero seconds")
 	}
-	return rateLimitInput{maxMessages: maxMessages, windowSeconds: windowSeconds}, nil
+	return rateLimitInput{mode: store.RateLimitModeManual, maxMessages: maxMessages, windowSeconds: windowSeconds}, nil
 }
 
 func parseAppRateLimitForm(r *http.Request, l1Max, domainMax int, domainActive bool) (rateLimitInput, error) {
@@ -65,10 +105,11 @@ func parseAppRateLimitForm(r *http.Request, l1Max, domainMax int, domainActive b
 	if r.PostFormValue("clear") != "" {
 		return rateLimitInput{clear: true}, nil
 	}
-	rawMax := strings.TrimSpace(r.PostFormValue("max_messages"))
-	if rawMax == "" {
-		return rateLimitInput{clear: true}, nil
+	mode, err := parseRateLimitMode(r.PostFormValue("mode"))
+	if err != nil {
+		return rateLimitInput{}, err
 	}
+
 	ips, err := parseIPList(r.PostFormValue("allowed_ips"))
 	if err != nil {
 		return rateLimitInput{}, err
@@ -76,6 +117,19 @@ func parseAppRateLimitForm(r *http.Request, l1Max, domainMax int, domainActive b
 	if len(ips) == 0 {
 		return rateLimitInput{}, fmt.Errorf("enter at least one trusted client IP for an application override")
 	}
+
+	if mode == store.RateLimitModeAuto {
+		mult, err := parseAutoMultiplier(r.PostFormValue("auto_multiplier"))
+		if err != nil {
+			return rateLimitInput{}, err
+		}
+		return rateLimitInput{mode: mode, ips: ips, autoMultiplier: mult}, nil
+	}
+
+	rawMax := strings.TrimSpace(r.PostFormValue("max_messages"))
+	if rawMax == "" {
+		return rateLimitInput{clear: true}, nil
+	}
 	maxMessages, err := parsePositiveInt(rawMax, 0)
 	if err != nil || maxMessages <= 0 {
 		return rateLimitInput{}, fmt.Errorf("enter a message limit greater than zero")
@@ -90,7 +144,7 @@ func parseAppRateLimitForm(r *http.Request, l1Max, domainMax int, domainActive b
 	if err != nil || windowSeconds <= 0 {
 		return rateLimitInput{}, fmt.Errorf("enter a time window greater than zero seconds")
 	}
-	return rateLimitInput{ips: ips, maxMessages: maxMessages, windowSeconds: windowSeconds}, nil
+	return rateLimitInput{mode: store.RateLimitModeManual, ips: ips, maxMessages: maxMessages, windowSeconds: windowSeconds}, nil
 }
 
 func parseIPList(raw string) ([]string, error) {
@@ -134,7 +188,7 @@ func (h *Handlers) HandleDomainRateLimit(w http.ResponseWriter, r *http.Request)
 		})
 		return
 	}
-	if err := h.applyRateLimit(in, h.domains.SaveRateLimit, h.domains.ClearRateLimit, d.ID); err != nil {
+	if err := h.applyDomainRateLimit(in, d.ID); err != nil {
 		logf("panel: domain %d: save rate limit: %v", d.ID, err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
@@ -167,7 +221,7 @@ func (h *Handlers) HandleAppRateLimit(w http.ResponseWriter, r *http.Request) {
 		})
 		return
 	}
-	if err := h.applyRateLimit(in, h.apps.SaveRateLimit, h.apps.ClearRateLimit, a.ID); err != nil {
+	if err := h.applyAppRateLimit(in, a.ID); err != nil {
 		logf("panel: application %d: save rate limit: %v", a.ID, err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
@@ -175,14 +229,83 @@ func (h *Handlers) HandleAppRateLimit(w http.ResponseWriter, r *http.Request) {
 	http.Redirect(w, r, fmt.Sprintf("/domains/%d?ratelimit=1", a.DomainID), http.StatusSeeOther)
 }
 
-func (h *Handlers) applyRateLimit(
-	in rateLimitInput,
-	save func(id int64, ips []string, maxMessages, windowSeconds int) error,
-	clear func(id int64) error,
-	id int64,
-) error {
-	if in.clear {
-		return clear(id)
+func (h *Handlers) HandleDomainRateLimitRecalc(w http.ResponseWriter, r *http.Request) {
+	d, ok := h.lookupDomain(w, r)
+	if !ok {
+		return
 	}
-	return save(id, in.ips, in.maxMessages, in.windowSeconds)
+	if err := h.recalcRateLimit(store.RateLimitScopeDomain, d.ID); err != nil {
+		logf("panel: domain %d: recalc rate limit: %v", d.ID, err)
+		h.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{
+			FormMode:     store.AddressModeWildcard,
+			RateLimitErr: err.Error(),
+		})
+		return
+	}
+	http.Redirect(w, r, fmt.Sprintf("/domains/%d?recalculated=1", d.ID), http.StatusSeeOther)
+}
+
+func (h *Handlers) HandleAppRateLimitRecalc(w http.ResponseWriter, r *http.Request) {
+	a, ok := h.lookupApplication(w, r)
+	if !ok {
+		return
+	}
+	if err := h.recalcRateLimit(store.RateLimitScopeApp, a.ID); err != nil {
+		d, _ := h.domains.Get(a.DomainID)
+		h.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{
+			FormMode:     store.AddressModeWildcard,
+			RateLimitErr: fmt.Sprintf("%s: %s", a.Login, err.Error()),
+		})
+		return
+	}
+	http.Redirect(w, r, fmt.Sprintf("/domains/%d?recalculated=1", a.DomainID), http.StatusSeeOther)
+}
+
+func (h *Handlers) recalcRateLimit(scope string, refID int64) error {
+	return h.store.RecalcAutoRateLimit(scope, refID, h.sendLogRetentionDays(), h.l1Messages(), h.l1Window())
+}
+
+func (h *Handlers) applyDomainRateLimit(in rateLimitInput, domainID int64) error {
+	if in.clear {
+		return h.domains.ClearRateLimit(domainID)
+	}
+	rl := store.RateLimit{
+		Scope:          store.RateLimitScopeDomain,
+		RefID:          domainID,
+		Mode:           in.mode,
+		MaxMessages:    in.maxMessages,
+		WindowSeconds:  in.windowSeconds,
+		AutoMultiplier: in.autoMultiplier,
+	}
+	if in.mode == store.RateLimitModeAuto {
+		rl.WindowSeconds = h.l1Window()
+		if err := h.domains.SaveRateLimit(domainID, rl); err != nil {
+			return err
+		}
+		return h.recalcRateLimit(store.RateLimitScopeDomain, domainID)
+	}
+	return h.domains.SaveRateLimit(domainID, rl)
+}
+
+func (h *Handlers) applyAppRateLimit(in rateLimitInput, appID int64) error {
+	if in.clear {
+		return h.apps.ClearRateLimit(appID)
+	}
+	rl := store.RateLimit{
+		Scope:          store.RateLimitScopeApp,
+		RefID:          appID,
+		AllowedIPs:     in.ips,
+		Mode:           in.mode,
+		MaxMessages:    in.maxMessages,
+		WindowSeconds:  in.windowSeconds,
+		AutoMultiplier: in.autoMultiplier,
+	}
+	if in.mode == store.RateLimitModeAuto {
+		rl.WindowSeconds = h.l1Window()
+		if err := h.apps.SaveRateLimit(appID, rl); err != nil {
+			return err
+		}
+		return h.recalcRateLimit(store.RateLimitScopeApp, appID)
+	}
+	return h.apps.SaveRateLimit(appID, rl)
 }

internal/web/handlers/handlers_ratelimit_test.go

@@ -17,6 +17,7 @@ func TestParseDomainRateLimitForm(t *testing.T) {
 	}
 
 	in, err := parseDomainRateLimitForm(form(url.Values{
+		"mode":           {"manual"},
 		"max_messages":   {"50"},
 		"window_seconds": {"3600"},
 	}), 100)
@@ -30,6 +31,7 @@ func TestParseDomainRateLimitForm(t *testing.T) {
 	}
 
 	_, err = parseDomainRateLimitForm(form(url.Values{
+		"mode":           {"manual"},
 		"max_messages":   {"150"},
 		"window_seconds": {"3600"},
 	}), 100)
@@ -47,6 +49,7 @@ func TestParseAppRateLimitForm(t *testing.T) {
 	}
 
 	in, err := parseAppRateLimitForm(form(url.Values{
+		"mode":           {"manual"},
 		"allowed_ips":    {"203.0.113.10"},
 		"max_messages":   {"80"},
 		"window_seconds": {"3600"},
@@ -56,6 +59,7 @@ func TestParseAppRateLimitForm(t *testing.T) {
 	}
 
 	_, err = parseAppRateLimitForm(form(url.Values{
+		"mode":           {"manual"},
 		"max_messages":   {"80"},
 		"window_seconds": {"3600"},
 	}), 100, 40, true)
@@ -64,6 +68,7 @@ func TestParseAppRateLimitForm(t *testing.T) {
 	}
 
 	_, err = parseAppRateLimitForm(form(url.Values{
+		"mode":           {"manual"},
 		"allowed_ips":    {"203.0.113.10"},
 		"max_messages":   {"40"},
 		"window_seconds": {"3600"},
@@ -73,6 +78,7 @@ func TestParseAppRateLimitForm(t *testing.T) {
 	}
 
 	_, err = parseAppRateLimitForm(form(url.Values{
+		"mode":           {"manual"},
 		"allowed_ips":    {"203.0.113.10"},
 		"max_messages":   {"150"},
 		"window_seconds": {"3600"},
@@ -83,6 +89,7 @@ func TestParseAppRateLimitForm(t *testing.T) {
 
 	// No domain limit: any app ceiling ≤ L1 is fine.
 	in, err = parseAppRateLimitForm(form(url.Values{
+		"mode":           {"manual"},
 		"allowed_ips":    {"203.0.113.10"},
 		"max_messages":   {"50"},
 		"window_seconds": {"3600"},
@@ -91,3 +98,26 @@ func TestParseAppRateLimitForm(t *testing.T) {
 		t.Fatalf("app without domain = %+v err=%v", in, err)
 	}
 }
+
+func TestParseDomainRateLimitFormAuto(t *testing.T) {
+	t.Parallel()
+	form := func(vals url.Values) *http.Request {
+		r := httptest.NewRequest(http.MethodPost, "/", strings.NewReader(vals.Encode()))
+		r.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+		return r
+	}
+	in, err := parseDomainRateLimitForm(form(url.Values{
+		"mode":             {"auto"},
+		"auto_multiplier":  {"2.5"},
+	}), 100)
+	if err != nil || in.mode != "auto" || in.autoMultiplier != 2.5 {
+		t.Fatalf("auto domain = %+v err=%v", in, err)
+	}
+	_, err = parseDomainRateLimitForm(form(url.Values{
+		"mode":             {"auto"},
+		"auto_multiplier":  {"10"},
+	}), 100)
+	if err == nil {
+		t.Fatal("multiplier out of range should fail")
+	}
+}

internal/web/view/static/panel.js

@@ -61,6 +61,16 @@
       target: "[data-custom-address]",
       visible: function (el) { return el.value === el.dataset.customMode; }
     },
+    {
+      match: "select[data-ratelimit-mode]",
+      target: "[data-manual-fields]",
+      visible: function (el) { return el.value === "manual"; }
+    },
+    {
+      match: "select[data-ratelimit-mode]",
+      target: "[data-auto-fields]",
+      visible: function (el) { return el.value === "auto"; }
+    },
     {
       match: "select[data-global-role]",
       target: "[data-domain-pick]",

internal/web/view/templates/domain_detail.html

@@ -236,6 +236,28 @@
   </div>
 </div>
 
+<div class="card" id="send-stats">
+  <h2>Sending statistics ({{.StatsWindowDays}} days)</h2>
+  <p class="muted">One message = one queue id (many recipients count once).
+  Level-1 refusals are not in the send log — totals under-count strict IP
+  limits.{{if .StatsRetentionWarning}} Send log retention is shorter than
+  30&nbsp;days; statistics use the last {{.StatsWindowDays}}&nbsp;days only.{{end}}</p>
+  <div class="field-pair">
+    <div>
+      <label>Total messages</label>
+      <span>{{.DomainStats.Total}}</span>
+    </div>
+    <div>
+      <label>Peak rate (msg/h)</label>
+      <span>{{.DomainStats.PeakPerHour}}</span>
+    </div>
+    <div>
+      <label>Average rate (msg/h)</label>
+      <span>{{.DomainStats.AvgPerHour}}</span>
+    </div>
+  </div>
+</div>
+
 <div class="card" id="applications">
   <h2>Applications</h2>
   <p class="muted">SASL logins for this domain — wildcard (*@domain) or a fixed
@@ -250,6 +272,8 @@
           {{if eq .AddressMode $.Wildcard}}Any address of the domain — *@{{$.Domain.Name}}
           {{else}}Fixed list — {{range $i, $a := .Addresses}}{{if $i}}, {{end}}{{$a}}{{end}}{{end}}
         </p>
+        <p class="muted app-stats">{{.Stats.Total}} msg / {{$.StatsWindowDays}}d ·
+        peak {{.Stats.PeakPerHour}} msg/h · avg {{.Stats.AvgPerHour}} msg/h</p>
         <!-- One Edit panel (mode ‖ rate limit) opened by a checkbox and label
              rather than <details>, so the button row stays intact — see
              .panel-toggle in panel.css. -->
@@ -293,22 +317,41 @@
                   (≤ level&nbsp;1) and skip the domain check; everyone else uses
                   the domain level-2 limit{{if $.DomainHasRL}} ({{$.DomainRLMaxNum}}){{end}}
                   if set, otherwise level&nbsp;1.</p>
-                  <div class="field-pair">
-                    <div>
-                      <label>Message limit (max {{$.L1Messages}})</label>
-                      <input name="max_messages" type="number" min="1" max="{{$.L1Messages}}"
-                             value="{{.MaxText}}" placeholder="{{$.L1Messages}}">
-                    </div>
-                    <div>
-                      <label>Window (seconds)</label>
-                      <input name="window_seconds" type="number" min="1" value="{{.WindowVal}}">
+                  <label for="mode-{{.ID}}">Limit mode</label>
+                  <select id="mode-{{.ID}}" name="mode" data-ratelimit-mode>
+                    <option value="manual" {{if not .IsAuto}}selected{{end}}>Manual</option>
+                    <option value="auto" {{if .IsAuto}}selected{{end}}>Auto (from statistics)</option>
+                  </select>
+                  <div data-manual-fields>
+                    <div class="field-pair">
+                      <div>
+                        <label>Message limit (max {{$.L1Messages}})</label>
+                        <input name="max_messages" type="number" min="1" max="{{$.L1Messages}}"
+                               value="{{.MaxText}}" placeholder="{{$.L1Messages}}">
+                      </div>
+                      <div>
+                        <label>Window (seconds)</label>
+                        <input name="window_seconds" type="number" min="1" value="{{.WindowVal}}">
+                      </div>
                     </div>
                   </div>
+                  <div data-auto-fields>
+                    <label for="mult-{{.ID}}">Multiplier ({{$.MinAutoMultiplier}}–{{$.MaxAutoMultiplier}}, default {{$.DefaultAutoMultiplier}})</label>
+                    <input id="mult-{{.ID}}" name="auto_multiplier" type="number" min="{{$.MinAutoMultiplier}}"
+                           max="{{$.MaxAutoMultiplier}}" step="0.1" value="{{.AutoMultiplier}}">
+                    <p class="muted">Computed limit: <strong>{{.MaxText}}</strong> messages /
+                    {{$.L1Window}}&nbsp;s (level-1 window). Zero traffic keeps auto inactive until
+                    messages are sent.{{if .AutoUpdated}} Last recalculated {{.AutoUpdated}}.{{end}}
+                    Peak {{.Stats.PeakPerHour}} msg/h shown for comparison.</p>
+                  </div>
                 </form>
-                <!-- Saving and removing the limit are two posts; the Save
-                     button is bound by form= id so both buttons share a row. -->
                 <div class="panel-buttons">
                   <button type="submit" form="rl-{{.ID}}">Save limit</button>
+                  {{if .IsAuto}}
+                  <form class="inline" method="post" action="/applications/{{.ID}}/ratelimit/recalc">
+                    <button type="submit">Recalculate now</button>
+                  </form>
+                  {{end}}
                   {{if .HasLimit}}
                   <form class="inline" method="post" action="/applications/{{.ID}}/ratelimit"
                         data-confirm="Remove the rate limit for {{.Login}}? The domain limit (or level 1) will apply.">
@@ -365,23 +408,44 @@
       <p class="muted">Level&nbsp;1 backstop: {{.L1Messages}} messages / {{.L1Window}}s — <a href="/settings#rate-limits">Settings</a>.</p>
       <div class="check-col-fields">
         <form id="rl-domain" method="post" action="/domains/{{.Domain.ID}}/ratelimit">
-          <div class="field-pair">
-            <div>
-              <label for="d_max">Message limit (max {{.L1Messages}})</label>
-              <input id="d_max" name="max_messages" type="number" min="1" max="{{.L1Messages}}"
-                     value="{{.DomainRLMax}}" placeholder="{{.L1Messages}}">
-            </div>
-            <div>
-              <label for="d_win">Window (seconds)</label>
-              <input id="d_win" name="window_seconds" type="number" min="1" value="{{.DomainRLWin}}">
+          <label for="d_mode">Limit mode</label>
+          <select id="d_mode" name="mode" data-ratelimit-mode>
+            <option value="manual" {{if not .DomainRLAuto}}selected{{end}}>Manual</option>
+            <option value="auto" {{if .DomainRLAuto}}selected{{end}}>Auto (from statistics)</option>
+          </select>
+          <div data-manual-fields>
+            <div class="field-pair">
+              <div>
+                <label for="d_max">Message limit (max {{.L1Messages}})</label>
+                <input id="d_max" name="max_messages" type="number" min="1" max="{{.L1Messages}}"
+                       value="{{.DomainRLMax}}" placeholder="{{.L1Messages}}">
+              </div>
+              <div>
+                <label for="d_win">Window (seconds)</label>
+                <input id="d_win" name="window_seconds" type="number" min="1" value="{{.DomainRLWin}}">
+              </div>
             </div>
+            <p class="muted">Applies to every client IP on this domain. Leave the
+              message limit empty to use level&nbsp;1 only.</p>
+          </div>
+          <div data-auto-fields>
+            <label for="d_mult">Multiplier ({{.MinAutoMultiplier}}–{{.MaxAutoMultiplier}}, default {{.DefaultAutoMultiplier}})</label>
+            <input id="d_mult" name="auto_multiplier" type="number" min="{{.MinAutoMultiplier}}"
+                   max="{{.MaxAutoMultiplier}}" step="0.1" value="{{.DomainRLMultiplier}}">
+            <p class="muted">Computed limit: <strong>{{.DomainRLMax}}</strong> messages /
+            {{.L1Window}}&nbsp;s (level-1 window). Zero traffic keeps auto inactive until
+            messages are sent.{{if .DomainRLAutoUpdated}} Last recalculated {{.DomainRLAutoUpdated}}.{{end}}
+            Peak {{.DomainStats.PeakPerHour}} msg/h shown for comparison.</p>
           </div>
-          <p class="muted">Applies to every client IP on this domain. Leave the
-            message limit empty to use level&nbsp;1 only.</p>
         </form>
       </div>
       <div class="check-col-actions">
         <button type="submit" form="rl-domain">Save limit</button>
+        {{if .DomainRLAuto}}
+        <form class="inline" method="post" action="/domains/{{.Domain.ID}}/ratelimit/recalc">
+          <button type="submit">Recalculate now</button>
+        </form>
+        {{end}}
         {{if .DomainHasRL}}
         <form class="inline" method="post" action="/domains/{{.Domain.ID}}/ratelimit"
               data-confirm="Remove the domain rate limit? Only the global level-1 limit will apply.">

internal/web/web.go

@@ -167,11 +167,13 @@ func (s *Server) Handler() http.Handler {
 	authed.HandleFunc("POST /domains/{id}/delete", h.HandleDeleteDomain)
 	authed.HandleFunc("POST /domains/{id}/applications", h.HandleAddApplication)
 	authed.HandleFunc("POST /domains/{id}/ratelimit", h.HandleDomainRateLimit)
+	authed.HandleFunc("POST /domains/{id}/ratelimit/recalc", h.HandleDomainRateLimitRecalc)
 	authed.HandleFunc("POST /domains/{id}/dmarc", h.HandleDomainDMARC)
 	authed.HandleFunc("POST /domains/{id}/export", h.HandleExportDomain)
 	authed.HandleFunc("POST /applications/{aid}/mode", h.HandleUpdateAppMode)
 	authed.HandleFunc("POST /applications/{aid}/password", h.HandleRegenPassword)
 	authed.HandleFunc("POST /applications/{aid}/ratelimit", h.HandleAppRateLimit)
+	authed.HandleFunc("POST /applications/{aid}/ratelimit/recalc", h.HandleAppRateLimitRecalc)
 	authed.HandleFunc("POST /applications/{aid}/delete", h.HandleDeleteApplication)
 	authed.HandleFunc("POST /reload", h.HandleReload)