diff --git a/helm/templates/zh-cn.yaml b/helm/templates/zh-cn.yaml
index 0440bca3..3dffabbe 100644
--- a/helm/templates/zh-cn.yaml
+++ b/helm/templates/zh-cn.yaml
@@ -34,6 +34,9 @@ data:
         rule_group: "规则组"
         rule_level: "规则级别"
         name: "名称"
+        receiver: "接收者"
+        workload_type: "工作负载类型"
+        rule_type: "规则类型"
 kind: ConfigMap
 metadata:
   name: zh-cn
diff --git a/pkg/notify/notifier/email/email.go b/pkg/notify/notifier/email/email.go
index 2d93160b..4b1ff94f 100644
--- a/pkg/notify/notifier/email/email.go
+++ b/pkg/notify/notifier/email/email.go
@@ -203,6 +203,9 @@ func (n *Notifier) send(ctx context.Context, to, subject, body string) error {
 	if err != nil {
 		return err
 	}
+	if conn == nil {
+		return utils.Errorf("failed to connect to %s", addr)
+	}
 
 	c, err := smtp.NewClient(conn, n.receiver.SmartHost.Host)
 	if err != nil {