diff --git a/backend/services/notification.py b/backend/services/notification.py
index 5ebbee6..eef732b 100644
--- a/backend/services/notification.py
+++ b/backend/services/notification.py
@@ -52,7 +52,8 @@ def build_dingtalk_payload(
     """生成与 AutoPacking/upload_iap.py 一致的钉钉 Markdown 内容。"""
     mobiles = _normalize_mobiles(at_mobiles)
     # App_Store 包与 Ad Hoc 用不同标题，App_Store 只有 IPA 下载地址、无二维码。
-    heading = "【iOS】App_Store 包信息" if config_data.get("BUILD_TYPE") == "App_Store" else "【iOS】打包信息"
+    # 标题必须保留「打包」二字：钉钉机器人启用了自定义关键词，缺少关键词会被拒收。
+    heading = "【iOS】App_Store 打包信息" if config_data.get("BUILD_TYPE") == "App_Store" else "【iOS】打包信息"
     details = (
         f"**环境：** {config_data.get('SERVER', '')}\n\n"
         f"**版本：** {config_data.get('VERSION', '')}\n\n"
diff --git a/tests/test_notification.py b/tests/test_notification.py
index c75cb25..367fe4b 100644
--- a/tests/test_notification.py
+++ b/tests/test_notification.py
@@ -80,8 +80,8 @@ def test_dingtalk_payload_app_store_heading_and_no_qr():
         config, "https://oss.example.com/readoor/iOS/app_2_197_1.ipa"
     )
     text = payload["markdown"]["text"]
-    assert "## 【iOS】App_Store 包信息" in text
-    assert "## 【iOS】打包信息" not in text
+    # 标题保留「打包」二字，避免命中钉钉自定义关键词拦截
+    assert "## 【iOS】App_Store 打包信息" in text
     assert "**iOS 下载链接:** https://oss.example.com/readoor/iOS/app_2_197_1.ipa" in text
     assert "![image]" not in text
 
@@ -104,7 +104,7 @@ def test_dingtalk_notification_app_store_uses_own_at_list():
 
     sent = post.call_args.kwargs["json"]
     assert sent["at"]["atMobiles"] == ["13911111111", "13922222222"]
-    assert "## 【iOS】App_Store 包信息" in sent["markdown"]["text"]
+    assert "## 【iOS】App_Store 打包信息" in sent["markdown"]["text"]
     assert "@13800000000" not in sent["markdown"]["text"]