diff --git a/src/components/MoneyInput.vue b/src/components/MoneyInput.vue
index c7dbcf7..29a2bbd 100644
--- a/src/components/MoneyInput.vue
+++ b/src/components/MoneyInput.vue
@@ -10,6 +10,7 @@ import {
 /**
  * Money field bound to **rial** storage values (API/DB).
  * User types and sees **toman** (÷10 / ×10 at the edges).
+ * With `nullable`, empty input emits `null` (for optional thresholds).
  */
 const props = withDefaults(
   defineProps<{
@@ -18,23 +19,33 @@ const props = withDefaults(
     placeholder?: string
     allowNegative?: boolean
     disabled?: boolean
+    nullable?: boolean
   }>(),
   {
     size: 'large',
     placeholder: '',
     allowNegative: false,
     disabled: false,
+    nullable: false,
   },
 )
 
 const emit = defineEmits<{
-  (e: 'update:value', value: number): void
+  (e: 'update:value', value: number | null): void
 }>()
 
-const display = computed(() => toGroupedDisplay(rialToToman(props.value ?? 0)))
+const display = computed(() => {
+  if (props.nullable && (props.value == null || props.value === undefined)) return ''
+  return toGroupedDisplay(rialToToman(props.value ?? 0))
+})
 
 function onInput(raw: string | number) {
-  const toman = fromGroupedInput(String(raw ?? ''), props.allowNegative)
+  const text = String(raw ?? '').trim()
+  if (props.nullable && !text) {
+    emit('update:value', null)
+    return
+  }
+  const toman = fromGroupedInput(text, props.allowNegative)
   emit('update:value', tomanToRial(toman))
 }
 </script>
@@ -47,6 +58,7 @@ function onInput(raw: string | number) {
     :placeholder="placeholder"
     :disabled="disabled"
     :value="display"
+    allow-clear
     @update:value="onInput"
   />
 </template>
diff --git a/src/pages/SmsTenantPage.vue b/src/pages/SmsTenantPage.vue
index 0ef455f..382b517 100644
--- a/src/pages/SmsTenantPage.vue
+++ b/src/pages/SmsTenantPage.vue
@@ -50,6 +50,7 @@ const summary = ref<SmsSummary | null>(null)
 const form = reactive({
   pricePerPartRials: 2500,
   isBlocked: false,
+  autoBlockBelowRials: null as number | null,
   alertCriticalRials: 10000,
   alertWarningRials: 100000,
 })
@@ -113,6 +114,8 @@ async function loadDetail() {
     Object.assign(form, {
       pricePerPartRials: data.account.pricePerPartRials,
       isBlocked: data.account.isBlocked,
+      autoBlockBelowRials:
+        data.account.autoBlockBelowRials == null ? null : data.account.autoBlockBelowRials,
       alertCriticalRials: data.account.alertCriticalRials,
       alertWarningRials: data.account.alertWarningRials,
     })
@@ -150,6 +153,7 @@ async function saveThresholds() {
     await api.patch(`/sms/tenants/${tenantId.value}`, {
       alertCriticalRials: form.alertCriticalRials,
       alertWarningRials: form.alertWarningRials,
+      autoBlockBelowRials: form.autoBlockBelowRials,
     })
     message.success('آستانه‌ها ذخیره شد')
     await loadDetail()
@@ -511,6 +515,27 @@ onMounted(async () => {
               <a-button type="primary" size="large" :loading="saving" @click="saveThresholds">ذخیره آستانه‌ها</a-button>
             </div>
           </div>
+
+          <div class="subcard auto-block">
+            <h3>مسدودسازی خودکار ارسال</h3>
+            <p class="hint">
+              اگر مبلغی بگذارید و موجودی از آن کمتر شود، ارسال پیامک خودکار قطع می‌شود (کلید مسدودسازی
+              روشن نمی‌شود). خالی بگذارید تا فقط با کلید دستی مسدود شود.
+            </p>
+            <div class="threshold-grid">
+              <label>
+                <span class="tone-label">آستانه مسدودسازی خودکار (تومان)</span>
+                <MoneyInput
+                  v-model:value="form.autoBlockBelowRials"
+                  nullable
+                  placeholder="خالی = بدون مسدودسازی خودکار"
+                />
+              </label>
+              <a-button type="primary" size="large" :loading="saving" @click="saveThresholds">
+                ذخیره آستانه
+              </a-button>
+            </div>
+          </div>
         </section>
 
         <section class="panel-card">
@@ -845,6 +870,13 @@ onMounted(async () => {
   font-size: 0.92rem;
 }
 
+.subcard .hint {
+  margin: 8px 0 12px;
+  color: #64748b;
+  font-size: 0.85rem;
+  line-height: 1.7;
+}
+
 .subcard.sky {
   background: linear-gradient(160deg, #f0f9ff, #fff);
   border-color: #bae6fd;