Index: simplenews.module
===================================================================
--- simplenews.module	(revision 11)
+++ simplenews.module	(working copy)
@@ -1254,7 +1254,7 @@
  */
 function simplenews_mail_send($mail) {
   $from_email = isset($mail->from_address) ? $mail->from_address : variable_get('site_mail', ini_get('sendmail_from'));
-  $from = isset($mail->from_name) ? '"'. addslashes($mail->from_name).'" <'. $from_email .'>' : $from_email;
+  $from = isset($mail->from_name) ? '"'. mime_header_encode(addslashes($mail->from_name)).'" <'. $from_email .'>' : $from_email;
 
   $headers = array(
     //'From' => $from,