diff --git a/webapp/controller/KefuController.class.php b/webapp/controller/KefuController.class.php
index 0205825..d0310ae 100644
--- a/webapp/controller/KefuController.class.php
+++ b/webapp/controller/KefuController.class.php
@@ -73,23 +73,26 @@ class KefuController {
             $attachments .= $attachment['item_id'] . ':' . $attachment['count'] . ';';
         }
 
+        $params = array(
+            'to' => $accountid,
+            'game_id' => phpcommon\extractGameId($accountid),
+            'from' => '客服',
+            'mail_type' => '1',
+            'mail_subtype' => '0',
+            'subject' => '领奖',
+            'content' => '领取奖励',
+            'sendtime' => time(),
+            'ext' => '',
+            'expire_time' => time() + 3600 * 24,
+            'attachments' => $this->translateAttachments($config)
+        );
+        $params['c'] = 'Mail';
+        $params['a'] = 'sendMail';
+        $params['timestamp'] = time();
+        $params['sign'] = phpcommon\md5Sign($params, '14e1b600b1fd579f47433b88e8d85291', $params['timestamp']);
         $response = '';
         if (!phpcommon\HttpClient::get($url,
-                                       array(
-                                           'c' => 'Mail',
-                                           'a' => 'sendMail',
-                                           'to' => $accountid,
-                                           'game_id' => phpcommon\extractGameId($accountid),
-                                           'from' => '客服',
-                                           'mail_type' => '1',
-                                           'mail_subtype' => '0',
-                                           'subject' => '领奖',
-                                           'content' => '领取奖励',
-                                           'sendtime' => time(),
-                                           'ext' => '',
-                                           'expire_time' => time() + 3600 * 24,
-                                           'attachments' => $this->translateAttachments($config)
-                                       ),
+                                       $params,
                                        $response)) {
             return false;
         }