Index: htmlmail.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/htmlmail/htmlmail.module,v
retrieving revision 1.9.2.5
diff -u -p -r1.9.2.5 htmlmail.module
--- htmlmail.module	8 Jan 2009 06:39:18 -0000	1.9.2.5
+++ htmlmail.module	9 Jun 2009 17:29:47 -0000
@@ -17,9 +17,7 @@ function htmlmail_help($path, $arg) {
 }
 
 function htmlmail_mail_alter(&$message) {
-  $message['headers'] = array(
-    'Content-Type' => 'text/html; charset=UTF-8;',
-  );
+  $message['headers']['Content-Type'] = 'text/html; charset=UTF-8;';
 
   // as of d6 body may be array
   $message['body'] = is_array($message['body']) ? implode("\n\n", $message['body']) : $message['body'];