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@@ -38,21 +38,14 @@ class MailFun {
      */
     public static function mb_coding(string $str,array $appcode=[]){
         $str = trim($str," \t\n\r");
-        preg_match("/^=\?(.*)\?/U",$str,$code);
         $str = (new Header())->decode($str);
-//        if(str_starts_with($str, '=?')){
-//            try {
-//                $encode = @mb_detect_encoding($str, array_merge(array("ASCII",'UTF-8',"GB2312","GBK",'BIG5'),$appcode));
-//                if($encode){
-//                    return @mb_convert_encoding($str, 'UTF-8', $encode);
-//                }
-//            }catch (\Throwable $e){
-//
-//            }
-//        }
-        if(($code[1]??'utf-8') != 'utf-8'){
-            $str = mb_convert_encoding($str, 'UTF-8', $code[1]);
+        try {
+            $encode = mb_detect_encoding($str, array("ASCII",'UTF-8',"GB2312","GBK",'BIG5'));
+            if($encode && $encode != 'UTF-8'){
+                $str = mb_convert_encoding($str, 'UTF-8', $encode);
             }
+        }catch (\Throwable $e){}
+
 
         return $str;
     }