diff --git a/app/Console/Commands/NotifyUtilityFeeStatus.php b/app/Console/Commands/NotifyUtilityFeeStatus.php
index 97ed9e2..2a29faf 100644
--- a/app/Console/Commands/NotifyUtilityFeeStatus.php
+++ b/app/Console/Commands/NotifyUtilityFeeStatus.php
@@ -33,20 +33,42 @@ class NotifyUtilityFeeStatus extends Command
             ->where('due_date', '<', now()->startOfDay())
             ->update(['payment_status' => \App\Modules\Finance\Models\UtilityFee::STATUS_OVERDUE]);
 
-        // 2. 獲取需要處理的單據 (pending 或 overdue)
-        $unpaidFees = \App\Modules\Finance\Models\UtilityFee::whereIn('payment_status', [
+        // 2. 獲取可能需要處理的單據 (pending 或 overdue)
+        $feesToCheck = \App\Modules\Finance\Models\UtilityFee::whereIn('payment_status', [
                 \App\Modules\Finance\Models\UtilityFee::STATUS_PENDING,
                 \App\Modules\Finance\Models\UtilityFee::STATUS_OVERDUE
             ])
+            ->whereNotNull('due_date')
             ->orderBy('due_date', 'asc')
             ->get();
 
-        if ($unpaidFees->isEmpty()) {
-            $this->info("目前沒有需要繳納的公共事業費。");
+        if ($feesToCheck->isEmpty()) {
+            $this->info("目前沒有未繳納的公共事業費。");
             return 0;
         }
 
-        // 3. 讀取系統設定
+        // 3. 根據業務規則過濾出今天「真正」需要發信的單據
+        $today = now()->startOfDay();
+        $unpaidFees = $feesToCheck->filter(function ($fee) use ($today) {
+            $dueDate = \Illuminate\Support\Carbon::parse($fee->due_date)->startOfDay();
+            $diffInDays = $today->diffInDays($dueDate, false);
+
+            // 如果已經逾期 (overdue)，每天都要發信
+            if ($fee->payment_status === \App\Modules\Finance\Models\UtilityFee::STATUS_OVERDUE) {
+                return true;
+            }
+
+            // 如果是待繳納 (pending)，僅在特定天數發信
+            // 規則：到期前 7 天、3 天、當天 (0 天)
+            return in_array($diffInDays, [7, 3, 0]);
+        });
+
+        if ($unpaidFees->isEmpty()) {
+            $this->info("今日無符合發信條件的公共事業費提醒。");
+            return 0;
+        }
+
+        // 4. 讀取系統設定
         $senderEmail = \App\Modules\Core\Models\SystemSetting::getVal('notification.utility_fee_sender_email');
         $senderPassword = \App\Modules\Core\Models\SystemSetting::getVal('notification.utility_fee_sender_password');
         $recipientEmailsStr = \App\Modules\Core\Models\SystemSetting::getVal('notification.utility_fee_recipient_emails');