Index: unicode.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/unicode.inc,v
retrieving revision 1.16
diff -u -r1.16 unicode.inc
--- unicode.inc	9 Mar 2006 14:46:33 -0000	1.16
+++ unicode.inc	11 Mar 2006 22:32:52 -0000
@@ -223,7 +223,7 @@
  *   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 = '';