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@@ -81,9 +81,9 @@ class HotMail {
 
             // 是否是发件箱
             if($this->folder[$item['folder_id']] == '发件箱'){
-                $w = ['email' => explode(',',$item['to'])];
+                $w = ['email' => array_map('strtolower',explode(',',$item['to']))];
             }else{
-                $w = ['email' =>$item['from']];
+                $w = ['email' =>strtolower($item['from'])];
             }
             // 是否在 预热邮箱中
             $mkey = md5(dbWhere($w));