src/components/layout/MainContent.tsx

@@ -51,6 +51,10 @@ const LegacyProtocolsPage = lazyFeature(
   () => import('@/features/hardening/LegacyProtocolsPage'),
   (m) => m.LegacyProtocolsPage,
 );
+const TenantLegacyProtocols = lazyFeature(
+  () => import('@/features/hardening/TenantLegacyProtocols'),
+  (m) => m.TenantLegacyProtocols,
+);
 
 interface MainContentProps {
   viewName?: string;
@@ -150,10 +154,23 @@ function renderView(schema: Schema | null, viewName?: string, id?: string, secti
       return <TraceDetailView viewName={viewName} objectId={id} />;
     }
     const canUpdate = useAccountStore.getState().hasObjectPermission(resolved.permissionPrefix, 'Update');
-    if (!canUpdate) {
+    const page = canUpdate ? (
-      return <DynamicViewPage viewName={viewName} objectId={id} />;
+      <DynamicForm viewName={viewName} objectId={id} />
+    ) : (
+      <DynamicViewPage viewName={viewName} objectId={id} />
+    );
+    // INBUXA: a tenant's page carries its legacy protocols switch (LP-9). A
+    // tenant admin reads its tenant without changing it (MT-12), and may
+    // still turn the switch, so it shows on the read-only page too.
+    if (resolved.objectName === 'x:Tenant') {
+      return (
+        <div className="space-y-4">
+          <TenantLegacyProtocols tenantId={id} />
+          {page}
+        </div>
+      );
     }
-    return <DynamicForm viewName={viewName} objectId={id} />;
+    return page;
   }
 
   return <DynamicList viewName={viewName} />;

src/features/hardening/LegacyProtocolsBanner.tsx

@@ -15,24 +15,43 @@ import { Link } from 'react-router-dom';
 import { useTranslation } from 'react-i18next';
 import { ShieldCheck } from 'lucide-react';
 import { useAccountStore } from '@/stores/accountStore';
-import { fetchProtocolPolicy } from './protocolPolicy';
+import { fetchProtocolPolicy, fetchTenantPolicy } from './protocolPolicy';
 
 export const LEGACY_PROTOCOLS_VIEW = 'CustomComponent/LegacyProtocols';
 
 export function LegacyProtocolsBanner() {
   const { t } = useTranslation();
-  const canGet = useAccountStore((s) => s.hasObjectPermission('sysNetworkListener', 'Get'));
+  const canGetServer = useAccountStore((s) => s.hasObjectPermission('sysNetworkListener', 'Get'));
-  const [off, setOff] = useState(false);
+  const canGetTenant = useAccountStore((s) => s.hasObjectPermission('sysDomain', 'Get'));
+  const [off, setOff] = useState<null | 'server' | 'tenant'>(null);
 
   useEffect(() => {
-    if (!canGet) return;
+    if (!canGetServer && !canGetTenant) return;
     const controller = new AbortController();
-    fetchProtocolPolicy(controller.signal)
+    const signal = controller.signal;
-      .then((policy) => setOff(policy.legacyProtocols === 'disabled'))
+    (async () => {
-      // A banner is not worth an error: an older server simply has no switch.
+      // The server's switch first. Inside a tenant it can't be read, and the
-      .catch(() => setOff(false));
+      // tenant's own is the one to report (LP-18 at tenant scope).
+      try {
+        if (canGetServer) {
+          const policy = await fetchProtocolPolicy(signal);
+          if (!signal.aborted) setOff(policy.legacyProtocols === 'disabled' ? 'server' : null);
+          return;
+        }
+      } catch {
+        // Fall through to the tenant's.
+      }
+      try {
+        if (canGetTenant) {
+          const policy = await fetchTenantPolicy(null, signal);
+          if (!signal.aborted) setOff(policy.legacyProtocols === 'disabled' ? 'tenant' : null);
+        }
+      } catch {
+        // A banner is not worth an error: an older server simply has no switch.
+      }
+    })();
     return () => controller.abort();
-  }, [canGet]);
+  }, [canGetServer, canGetTenant]);
 
   if (!off) return null;
 
@@ -42,11 +61,18 @@ export function LegacyProtocolsBanner() {
       <span>
         {t('legacyProtocols.bannerLead', 'Legacy mail protocols are')}{' '}
         <strong>{t('legacyProtocols.bannerOff', 'off')}</strong>{' '}
-        {t('legacyProtocols.bannerTail', 'on this server. Only INBUXA webmail and JMAP apps can sign in.')}
+        {off === 'server'
+          ? t('legacyProtocols.bannerTail', 'on this server. Only INBUXA webmail and JMAP apps can sign in.')
+          : t(
+              'legacyProtocols.bannerTailTenant',
+              'for your organization. Only INBUXA webmail and JMAP apps can sign in.',
+            )}
       </span>
-      <Link to={`/Settings/${LEGACY_PROTOCOLS_VIEW}`} className="font-medium text-primary hover:underline">
+      {off === 'server' && (
-        {t('legacyProtocols.review', 'Review')}
+        <Link to={`/Settings/${LEGACY_PROTOCOLS_VIEW}`} className="font-medium text-primary hover:underline">
-      </Link>
+          {t('legacyProtocols.review', 'Review')}
+        </Link>
+      )}
     </div>
   );
 }

src/features/hardening/LegacyProtocolsPage.tsx

@@ -18,27 +18,20 @@ import { useCallback, useEffect, useState } from 'react';
 import { useTranslation } from 'react-i18next';
 import { AlertTriangle, Loader2, Lock, RotateCcw, ShieldCheck, ShieldOff } from 'lucide-react';
 import { Button } from '@/components/ui/button';
-import { Input } from '@/components/ui/input';
-import { Label } from '@/components/ui/label';
 import { LoadingFallback } from '@/components/common/LoadingFallback';
 import { useAccountStore } from '@/stores/accountStore';
 import { toast } from '@/hooks/use-toast';
 import { cn } from '@/lib/utils';
 import {
-  ago,
-  CONFIRM_PHRASE,
   describeListener,
-  impactEntries,
   fetchProtocolPolicy,
-  phraseMatches,
   PolicyUnavailable,
   protocolRows,
   updateProtocolPolicy,
-  type PolicyListener,
   type ProtocolPolicy,
   type ProtocolRow,
-  type RecentUse,
 } from './protocolPolicy';
+import { ConfirmTurnOff, ImpactPanel, Statement } from './parts';
 
 type Load = { kind: 'loading' } | { kind: 'ready'; policy: ProtocolPolicy } | { kind: 'error'; message: string };
 
@@ -47,7 +40,6 @@ export function LegacyProtocolsPage() {
   const canUpdate = useAccountStore((s) => s.hasObjectPermission('sysNetworkListener', 'Update'));
   const [load, setLoad] = useState<Load>({ kind: 'loading' });
   const [confirming, setConfirming] = useState(false);
-  const [typed, setTyped] = useState('');
   const [busy, setBusy] = useState(false);
 
   const loaded = useCallback(
@@ -86,7 +78,6 @@ export function LegacyProtocolsPage() {
         // overruled by the SMTP lock (LP-21), which the selector already shows.
         await updateProtocolPolicy({ legacyProtocols });
         setConfirming(false);
-        setTyped('');
         await refresh();
       } catch (e) {
         toast({
@@ -161,7 +152,7 @@ export function LegacyProtocolsPage() {
 
       {!off && policy.recentLegacyUse && <ImpactPanel recent={policy.recentLegacyUse} />}
 
-      {(off || confirming) && <Statement listeners={listeners} />}
+      {(off || confirming) && <Statement scope={{ kind: 'server', listeners }} />}
 
       {!off && canUpdate && !confirming && (
         <Button variant="destructive" onClick={() => setConfirming(true)}>
@@ -171,42 +162,13 @@ export function LegacyProtocolsPage() {
       )}
 
       {!off && confirming && (
-        <form
+        <ConfirmTurnOff
-          className="space-y-3 rounded-xl border p-4"
+          busy={busy}
-          onSubmit={(e) => {
+          onConfirm={() => void turn('disabled')}
-            e.preventDefault();
+          onCancel={() => {
-            if (phraseMatches(typed)) void turn('disabled');
+            setConfirming(false);
           }}
-        >
+        />
-          <Label htmlFor="legacy-confirm">
-            {t('legacyProtocols.typeToConfirm', 'To confirm, type')}{' '}
-            <code className="rounded bg-muted px-1.5 py-0.5 font-mono text-sm">{CONFIRM_PHRASE}</code>
-          </Label>
-          <Input
-            id="legacy-confirm"
-            autoComplete="off"
-            spellCheck={false}
-            value={typed}
-            onChange={(e) => setTyped(e.target.value)}
-          />
-          <div className="flex gap-2">
-            <Button type="submit" variant="destructive" disabled={busy || !phraseMatches(typed)}>
-              {busy && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
-              {t('legacyProtocols.confirm', 'Turn off legacy protocols')}
-            </Button>
-            <Button
-              type="button"
-              variant="ghost"
-              disabled={busy}
-              onClick={() => {
-                setConfirming(false);
-                setTyped('');
-              }}
-            >
-              {t('common.cancel', 'Cancel')}
-            </Button>
-          </div>
-        </form>
       )}
     </div>
   );
@@ -320,113 +282,3 @@ function ProtocolTable({ rows, off }: { rows: ProtocolRow[]; off: boolean }) {
     </div>
   );
 }
-
-/**
- * The impact panel (LP-15): who would notice, shown before anything can
- * change. With nobody, it says so in one line.
- */
-function ImpactPanel({ recent }: { recent: RecentUse[] }) {
-  const { t, i18n } = useTranslation();
-  const entries = impactEntries(recent);
-  // Read once, when the panel appears: "2 days ago" needn't tick.
-  const [now] = useState(() => Date.now());
-  if (entries.length === 0) {
-    return (
-      <p className="rounded-xl border px-4 py-3 text-sm text-muted-foreground">
-        {t('legacyProtocols.impactNone', 'No account used a legacy mail app in the last 30 days.')}
-      </p>
-    );
-  }
-  return (
-    <section className="space-y-2 rounded-xl border p-4 text-sm">
-      <p>
-        <strong>
-          {t('legacyProtocols.impactCount', {
-            count: entries.length,
-            defaultValue_one: '1 account used a legacy mail app in the last 30 days.',
-            defaultValue_other: '{{count}} accounts used a legacy mail app in the last 30 days.',
-          })}
-        </strong>{' '}
-        {t('legacyProtocols.impactLead', 'Their mail apps will stop working the moment you turn this on:')}
-      </p>
-      <ul className="max-h-72 space-y-1 overflow-y-auto">
-        {entries.map((entry) => (
-          <li key={entry.name} className="flex flex-wrap gap-x-2">
-            <span className="font-medium">{entry.name}</span>
-            <span className="text-muted-foreground">
-              {entry.protocols.join(', ')} · {ago(entry.lastUsedAt, now, i18n.language)}
-            </span>
-          </li>
-        ))}
-      </ul>
-    </section>
-  );
-}
-
-/** The statement (LP-16), at server scope, with the firewall note (LP-20). */
-function Statement({ listeners }: { listeners: PolicyListener[] }) {
-  const { t } = useTranslation();
-  return (
-    <section className="space-y-3 rounded-xl border border-amber-500/40 bg-amber-500/5 p-5 text-sm leading-relaxed">
-      <p className="text-base font-semibold">
-        {t('legacyProtocols.statementTitle', 'Only INBUXA webmail and JMAP apps will work.')}
-      </p>
-      <p>
-        {t(
-          'legacyProtocols.statementLead',
-          'Legacy mail protocols (IMAP, POP3, ManageSieve and sending from mail apps) will be turned off for everyone on this server.',
-        )}
-      </p>
-      <ul className="list-disc space-y-1 pl-5">
-        <li>
-          {t(
-            'legacyProtocols.statementApps',
-            'Phone and desktop mail apps will stop receiving and sending mail. That’s iPhone and iPad Mail, the Gmail and Outlook apps, Outlook, Thunderbird and Apple Mail. People will see sign-in errors in them.',
-          )}
-        </li>
-        <li>
-          {t(
-            'legacyProtocols.statementFilters',
-            'Filters managed from a mail app (ManageSieve) will stop working. Filters set in INBUXA webmail keep working.',
-          )}
-        </li>
-        <li>
-          {t(
-            'legacyProtocols.statementUnaffected',
-            'Incoming mail is not affected. Calendars and contacts are not affected.',
-          )}
-        </li>
-        <li>
-          {t(
-            'legacyProtocols.statementWebmail',
-            'People keep full access through INBUXA webmail, which can be installed as an app on phones and computers.',
-          )}
-        </li>
-      </ul>
-      <p>
-        {listeners.length > 0
-          ? t('legacyProtocols.statementPorts', 'The IMAP, POP3 and ManageSieve ports will close: {{list}}.', {
-              list: listeners.map(describeListener).join(', '),
-            })
-          : t(
-              'legacyProtocols.statementNoPorts',
-              'No IMAP, POP3 or ManageSieve listeners are configured, so no ports will close.',
-            )}
-      </p>
-      <p>
-        {t(
-          'legacyProtocols.statementSubmission',
-          'Sending from mail apps (SMTP submission) will stop working, but its ports stay open: mail apps will be told they cannot sign in. Incoming mail (SMTP) and INBUXA webmail (JMAP) are not affected and cannot be turned off here.',
-        )}
-      </p>
-      <p>
-        <strong>{t('legacyProtocols.firewallLead', 'This does not change your firewall or port forwarding.')}</strong>{' '}
-        {t(
-          'legacyProtocols.firewallBody',
-          'INBUXA stops answering on these ports; anything that still routes them to this server — firewall rules, NAT port-forwards, a load balancer or proxy — is yours to reconcile.',
-        )}
-      </p>
-      <p>{t('legacyProtocols.statementUndo', 'You can turn legacy protocols back on at any time.')}</p>
-    </section>
-  );
-}

src/features/hardening/TenantLegacyProtocols.tsx

@@ -0,0 +1,138 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Coffey Labs
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/**
+ * INBUXA: one tenant's legacy mail protocols switch, on the tenant's page
+ * (legacy-protocols spec, LP-9 to LP-18 at tenant scope).
+ *
+ * It closes no port -- other tenants share them (LP-13) -- so the statement
+ * names no listener and carries no firewall note. It refuses sign-in over
+ * legacy protocols on the tenant's domains. Turning it off takes the typed
+ * phrase; turning it back on is one click, which the server refuses while
+ * it has legacy protocols off itself (LP-9), and says so.
+ */
+
+import { useCallback, useEffect, useState } from 'react';
+import { useTranslation } from 'react-i18next';
+import { Loader2, ShieldCheck, ShieldOff } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { useAccountStore } from '@/stores/accountStore';
+import { toast } from '@/hooks/use-toast';
+import { cn } from '@/lib/utils';
+import { getAccountId, jmapGet } from '@/services/jmap/client';
+import { fetchTenantPolicy, PolicyUnavailable, updateTenantPolicy, type TenantPolicy } from './protocolPolicy';
+import { ConfirmTurnOff, ImpactPanel, Statement } from './parts';
+
+export function TenantLegacyProtocols({ tenantId }: { tenantId: string }) {
+  const { t } = useTranslation();
+  const canGet = useAccountStore((s) => s.hasObjectPermission('sysDomain', 'Get'));
+  const canUpdate = useAccountStore((s) => s.hasObjectPermission('sysDomain', 'Update'));
+  const [policy, setPolicy] = useState<TenantPolicy | null>(null);
+  const [organization, setOrganization] = useState('');
+  const [confirming, setConfirming] = useState(false);
+  const [busy, setBusy] = useState(false);
+
+  const loaded = useCallback(
+    (fetching: Promise<TenantPolicy>, signal?: AbortSignal) =>
+      fetching
+        .then((p) => {
+          if (!signal?.aborted) setPolicy(p);
+        })
+        .catch((e: unknown) => {
+          // An older server has no tenant switch: show nothing rather than an error.
+          if (!signal?.aborted && !(e instanceof PolicyUnavailable)) console.error(e);
+        }),
+    [],
+  );
+
+  useEffect(() => {
+    if (!canGet) return;
+    const controller = new AbortController();
+    void loaded(fetchTenantPolicy(tenantId, controller.signal), controller.signal);
+    // The organization's name, for the statement.
+    jmapGet('x:Tenant', getAccountId('x:Tenant'), [tenantId], ['name'], controller.signal)
+      .then((responses) => {
+        const list = (responses[0]?.[1] as { list?: { name?: string }[] } | undefined)?.list;
+        if (!controller.signal.aborted && list?.[0]?.name) setOrganization(list[0].name);
+      })
+      .catch(() => {});
+    return () => controller.abort();
+  }, [tenantId, canGet, loaded]);
+
+  const turn = useCallback(
+    async (value: 'enabled' | 'disabled') => {
+      setBusy(true);
+      try {
+        await updateTenantPolicy(tenantId, value);
+        setConfirming(false);
+        await loaded(fetchTenantPolicy(tenantId));
+      } catch (e) {
+        toast({
+          variant: 'destructive',
+          title: t('legacyProtocols.failed', 'The switch did not change'),
+          description: e instanceof Error ? e.message : String(e),
+        });
+      } finally {
+        setBusy(false);
+      }
+    },
+    [tenantId, loaded, t],
+  );
+
+  if (!policy) return null;
+  const off = policy.legacyProtocols === 'disabled';
+  const name = organization || t('legacyProtocols.thisOrganization', 'this organization');
+
+  return (
+    // Aligned with the tenant form beneath it.
+    <section className="mx-auto max-w-4xl space-y-4 rounded-xl border p-4">
+      <div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
+        <div className="flex items-start gap-3">
+          {off ? (
+            <ShieldCheck className="mt-0.5 h-5 w-5 shrink-0 text-emerald-600" />
+          ) : (
+            <ShieldOff className="mt-0.5 h-5 w-5 shrink-0 text-muted-foreground" />
+          )}
+          <div>
+            <p className="font-medium">{t('legacyProtocols.title', 'Legacy mail protocols')}</p>
+            <p className={cn('text-sm', off ? 'text-foreground' : 'text-muted-foreground')}>
+              {off
+                ? t(
+                    'legacyProtocols.tenantOff',
+                    'Off for {{organization}}. Only INBUXA webmail and JMAP apps can sign in to its domains.',
+                    { organization: name },
+                  )
+                : t(
+                    'legacyProtocols.tenantOn',
+                    'On for {{organization}}. Mail apps can use IMAP, POP3 and ManageSieve on its domains.',
+                    { organization: name },
+                  )}
+            </p>
+          </div>
+        </div>
+        {canUpdate && off && (
+          <Button variant="outline" disabled={busy} onClick={() => void turn('enabled')} className="shrink-0">
+            {busy && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
+            {t('legacyProtocols.turnOn', 'Turn legacy protocols back on')}
+          </Button>
+        )}
+        {canUpdate && !off && !confirming && (
+          <Button variant="destructive" onClick={() => setConfirming(true)} className="shrink-0">
+            {t('legacyProtocols.turnOff', 'Turn off legacy protocols…')}
+          </Button>
+        )}
+      </div>
+
+      {!off && confirming && (
+        <>
+          {policy.recentLegacyUse && <ImpactPanel recent={policy.recentLegacyUse} />}
+          <Statement scope={{ kind: 'tenant', organization: name }} />
+          <ConfirmTurnOff busy={busy} onConfirm={() => void turn('disabled')} onCancel={() => setConfirming(false)} />
+        </>
+      )}
+    </section>
+  );
+}

src/features/hardening/parts.tsx

@@ -0,0 +1,201 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Coffey Labs
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/**
+ * INBUXA: the parts the server's switch (Settings › Security › Hardening) and
+ * a tenant's switch (each tenant's page) share: the impact panel (LP-15), the
+ * statement (LP-16) and the typed confirmation (LP-17).
+ */
+
+import { useState } from 'react';
+import { useTranslation } from 'react-i18next';
+import { Loader2 } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { Input } from '@/components/ui/input';
+import { Label } from '@/components/ui/label';
+import {
+  ago,
+  CONFIRM_PHRASE,
+  describeListener,
+  impactEntries,
+  phraseMatches,
+  type PolicyListener,
+  type RecentUse,
+} from './protocolPolicy';
+
+/**
+ * The typed confirmation to turn legacy protocols off (LP-17): the button
+ * stays disabled until the phrase matches exactly.
+ */
+export function ConfirmTurnOff({
+  busy,
+  onConfirm,
+  onCancel,
+}: {
+  busy: boolean;
+  onConfirm: () => void;
+  onCancel: () => void;
+}) {
+  const { t } = useTranslation();
+  const [typed, setTyped] = useState('');
+  return (
+    <form
+      className="space-y-3 rounded-xl border p-4"
+      onSubmit={(e) => {
+        e.preventDefault();
+        if (phraseMatches(typed)) onConfirm();
+      }}
+    >
+      <Label htmlFor="legacy-confirm">
+        {t('legacyProtocols.typeToConfirm', 'To confirm, type')}{' '}
+        <code className="rounded bg-muted px-1.5 py-0.5 font-mono text-sm">{CONFIRM_PHRASE}</code>
+      </Label>
+      <Input
+        id="legacy-confirm"
+        autoComplete="off"
+        spellCheck={false}
+        value={typed}
+        onChange={(e) => setTyped(e.target.value)}
+      />
+      <div className="flex gap-2">
+        <Button type="submit" variant="destructive" disabled={busy || !phraseMatches(typed)}>
+          {busy && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
+          {t('legacyProtocols.confirm', 'Turn off legacy protocols')}
+        </Button>
+        <Button type="button" variant="ghost" disabled={busy} onClick={onCancel}>
+          {t('common.cancel', 'Cancel')}
+        </Button>
+      </div>
+    </form>
+  );
+}
+
+/**
+ * The impact panel (LP-15): who would notice, shown before anything can
+ * change. With nobody, it says so in one line.
+ */
+export function ImpactPanel({ recent }: { recent: RecentUse[] }) {
+  const { t, i18n } = useTranslation();
+  const entries = impactEntries(recent);
+  // Read once, when the panel appears: "2 days ago" needn't tick.
+  const [now] = useState(() => Date.now());
+  if (entries.length === 0) {
+    return (
+      <p className="rounded-xl border px-4 py-3 text-sm text-muted-foreground">
+        {t('legacyProtocols.impactNone', 'No account used a legacy mail app in the last 30 days.')}
+      </p>
+    );
+  }
+  return (
+    <section className="space-y-2 rounded-xl border p-4 text-sm">
+      <p>
+        <strong>
+          {t('legacyProtocols.impactCount', {
+            count: entries.length,
+            defaultValue_one: '1 account used a legacy mail app in the last 30 days.',
+            defaultValue_other: '{{count}} accounts used a legacy mail app in the last 30 days.',
+          })}
+        </strong>{' '}
+        {t('legacyProtocols.impactLead', 'Their mail apps will stop working the moment you turn this on:')}
+      </p>
+      <ul className="max-h-72 space-y-1 overflow-y-auto">
+        {entries.map((entry) => (
+          <li key={entry.name} className="flex flex-wrap gap-x-2">
+            <span className="font-medium">{entry.name}</span>
+            <span className="text-muted-foreground">
+              {entry.protocols.join(', ')} · {ago(entry.lastUsedAt, now, i18n.language)}
+            </span>
+          </li>
+        ))}
+      </ul>
+    </section>
+  );
+}
+
+/** Whose switch the statement is about: the server's, naming what closes, or a tenant's. */
+export type StatementScope = { kind: 'server'; listeners: PolicyListener[] } | { kind: 'tenant'; organization: string };
+
+/**
+ * The statement (LP-16). At server scope it names the ports that close and
+ * carries the firewall note (LP-20); at tenant scope no port closes, so
+ * neither is said (LP-13).
+ */
+export function Statement({ scope }: { scope: StatementScope }) {
+  const { t } = useTranslation();
+  return (
+    <section className="space-y-3 rounded-xl border border-amber-500/40 bg-amber-500/5 p-5 text-sm leading-relaxed">
+      <p className="text-base font-semibold">
+        {t('legacyProtocols.statementTitle', 'Only INBUXA webmail and JMAP apps will work.')}
+      </p>
+      <p>
+        {scope.kind === 'server'
+          ? t(
+              'legacyProtocols.statementLead',
+              'Legacy mail protocols (IMAP, POP3, ManageSieve and sending from mail apps) will be turned off for everyone on this server.',
+            )
+          : t(
+              'legacyProtocols.statementLeadTenant',
+              'Legacy mail protocols (IMAP, POP3, ManageSieve and sending from mail apps) will be turned off for everyone in {{organization}}.',
+              { organization: scope.organization },
+            )}
+      </p>
+      <ul className="list-disc space-y-1 pl-5">
+        <li>
+          {t(
+            'legacyProtocols.statementApps',
+            'Phone and desktop mail apps will stop receiving and sending mail. That’s iPhone and iPad Mail, the Gmail and Outlook apps, Outlook, Thunderbird and Apple Mail. People will see sign-in errors in them.',
+          )}
+        </li>
+        <li>
+          {t(
+            'legacyProtocols.statementFilters',
+            'Filters managed from a mail app (ManageSieve) will stop working. Filters set in INBUXA webmail keep working.',
+          )}
+        </li>
+        <li>
+          {t(
+            'legacyProtocols.statementUnaffected',
+            'Incoming mail is not affected. Calendars and contacts are not affected.',
+          )}
+        </li>
+        <li>
+          {t(
+            'legacyProtocols.statementWebmail',
+            'People keep full access through INBUXA webmail, which can be installed as an app on phones and computers.',
+          )}
+        </li>
+      </ul>
+      {scope.kind === 'server' && (
+        <p>
+          {scope.listeners.length > 0
+            ? t('legacyProtocols.statementPorts', 'The IMAP, POP3 and ManageSieve ports will close: {{list}}.', {
+                list: scope.listeners.map(describeListener).join(', '),
+              })
+            : t(
+                'legacyProtocols.statementNoPorts',
+                'No IMAP, POP3 or ManageSieve listeners are configured, so no ports will close.',
+              )}
+        </p>
+      )}
+      <p>
+        {t(
+          'legacyProtocols.statementSubmission',
+          'Sending from mail apps (SMTP submission) will stop working, but its ports stay open: mail apps will be told they cannot sign in. Incoming mail (SMTP) and INBUXA webmail (JMAP) are not affected and cannot be turned off here.',
+        )}
+      </p>
+      {scope.kind === 'server' && (
+        <p>
+          <strong>{t('legacyProtocols.firewallLead', 'This does not change your firewall or port forwarding.')}</strong>{' '}
+          {t(
+            'legacyProtocols.firewallBody',
+            'INBUXA stops answering on these ports; anything that still routes them to this server — firewall rules, NAT port-forwards, a load balancer or proxy — is yours to reconcile.',
+          )}
+        </p>
+      )}
+      <p>{t('legacyProtocols.statementUndo', 'You can turn legacy protocols back on at any time.')}</p>
+    </section>
+  );
+}

src/features/hardening/protocolPolicy.test.ts

@@ -10,6 +10,7 @@ import {
   CONFIRM_PHRASE,
   impactEntries,
   parsePolicy,
+  parseTenantPolicy,
   phraseMatches,
   protocolRows,
   type ProtocolPolicy,
@@ -120,3 +121,18 @@ describe('the impact panel (LP-15)', () => {
     expect(ago(now - 10_000, now, 'en')).toBe('this minute');
   });
 });
+
+describe("a tenant's switch", () => {
+  it('reads the wire, and tells an older server from nobody', () => {
+    const p = parseTenantPolicy({
+      id: 'b',
+      tenantId: 'b',
+      legacyProtocols: 'disabled',
+      changedAt: 5,
+      recentLegacyUse: [{ accountId: 'c', name: '[email protected]', protocol: 'imap', lastUsedAt: 9 }],
+    });
+    expect(p).toMatchObject({ id: 'b', legacyProtocols: 'disabled', changedAt: 5 });
+    expect(p.recentLegacyUse).toHaveLength(1);
+    expect(parseTenantPolicy({ id: 'b' })).toMatchObject({ legacyProtocols: 'enabled', recentLegacyUse: null });
+  });
+});

src/features/hardening/protocolPolicy.ts

@@ -256,3 +256,65 @@ export function phraseMatches(typed: string): boolean {
 export function describeListener(l: PolicyListener): string {
   return l.ports.length > 0 ? `${l.name} (${l.ports.join(', ')})` : l.name;
 }
+
+// ---- A tenant's switch: inbuxa:TenantProtocolPolicy (LP-9 to LP-14) ----
+
+const TENANT_OBJECT = 'inbuxa:TenantProtocolPolicy';
+
+export interface TenantPolicy {
+  /** The tenant's id, which is also the policy's. */
+  id: string;
+  legacyProtocols: 'enabled' | 'disabled';
+  /** Milliseconds since the epoch. */
+  changedAt: number | null;
+  /** The tenant's own people who used a legacy mail app lately (LP-15), or null from an older server. */
+  recentLegacyUse: RecentUse[] | null;
+}
+
+export function parseTenantPolicy(raw: Record<string, unknown>): TenantPolicy {
+  return {
+    id: typeof raw.id === 'string' ? raw.id : '',
+    legacyProtocols: raw.legacyProtocols === 'disabled' ? 'disabled' : 'enabled',
+    changedAt: typeof raw.changedAt === 'number' ? raw.changedAt : null,
+    recentLegacyUse: Array.isArray(raw.recentLegacyUse) ? parseRecent(raw.recentLegacyUse) : null,
+  };
+}
+
+/**
+ * A tenant's switch. With no id, the caller's own tenant's -- which is how a
+ * tenant administrator reads it; a server administrator names the tenant.
+ */
+export async function fetchTenantPolicy(tenantId: string | null, signal?: AbortSignal): Promise<TenantPolicy> {
+  const accountId = getAccountId('x:Domain');
+  const responses = await jmapRequest(
+    [[`${TENANT_OBJECT}/get`, { accountId, ids: tenantId ? [tenantId] : null }, '0']],
+    signal,
+    [INBUXA_CAPABILITY],
+  );
+  const [name, result] = responses[0] ?? [];
+  if (name !== `${TENANT_OBJECT}/get`) {
+    const type = (result as { type?: string } | undefined)?.type;
+    if (type === 'unknownMethod' || type === 'unknownCapability') throw new PolicyUnavailable(type);
+    throw new Error((result as { description?: string } | undefined)?.description ?? type ?? 'Request failed');
+  }
+  const list = (result as { list?: Record<string, unknown>[] }).list ?? [];
+  // A tenant admin's /get with no ids holds exactly its own tenant's.
+  if (!list[0] || (!tenantId && list.length !== 1)) throw new PolicyUnavailable('notFound');
+  return parseTenantPolicy(list[0]);
+}
+
+/** Turns a tenant's switch. The server refuses turning it on while its own is off (LP-9). */
+export async function updateTenantPolicy(tenantId: string, legacyProtocols: 'enabled' | 'disabled'): Promise<void> {
+  const accountId = getAccountId('x:Domain');
+  const responses = await jmapRequest(
+    [[`${TENANT_OBJECT}/set`, { accountId, update: { [tenantId]: { legacyProtocols } } }, '0']],
+    undefined,
+    [INBUXA_CAPABILITY],
+  );
+  const [name, result] = responses[0] ?? [];
+  if (name !== `${TENANT_OBJECT}/set`) {
+    throw new Error((result as { description?: string } | undefined)?.description ?? 'Request failed');
+  }
+  const failed = (result as { notUpdated?: Record<string, JmapSetError> | null }).notUpdated?.[tenantId];
+  if (failed) throw new Error(failed.description ?? failed.type);
+}