- Skip conversion when input charset is BINARY

program/include/main.inc

@@ -341,6 +341,9 @@ function rcube_parse_charset($input)
     '/^X-/',            // X- prefix (e.g. X-ROMAN8 => ROMAN8)
     ), '', $charset);
 
+  if ($charset == 'BINARY')
+    return $charsets[$input] = null;
+
   # Aliases: some of them from HTML5 spec.
   $aliases = array(
     'USASCII'       => 'WINDOWS-1252',