Index: includes/common.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/common.inc,v
retrieving revision 1.434.2.18
diff -u -p -r1.434.2.18 common.inc
--- includes/common.inc	9 Feb 2006 08:57:47 -0000	1.434.2.18
+++ includes/common.inc	13 Mar 2006 09:08:50 -0000
@@ -1694,7 +1694,7 @@ function truncate_utf8($string, $len, $w
  *   have to be changed to \r\n or \r.
  */
 function mime_header_encode($string) {
-  if (!preg_match('/^[\x20-\x7E]*$/', $string)) {
+  if (preg_match('/[^\x20-\x7E]/', $string)) {
     $chunk_size = 47; // floor((75 - strlen("=?UTF-8?B??=")) * 0.75);
     $len = strlen($string);
     $output = '';