Index: wp-includes/class-phpmailer.php
===================================================================
--- wp-includes/class-phpmailer.php	(revision 19641)
+++ wp-includes/class-phpmailer.php	(working copy)
@@ -757,7 +757,7 @@
    * @return bool
    */
   protected function SmtpSend($header, $body) {
-    require_once $this->PluginDir . 'class.smtp.php';
+    require_once $this->PluginDir . 'class-smtp.php';
     $bad_rcpt = array();
 
     if(!$this->SmtpConnect()) {
@@ -2470,4 +2470,4 @@
     return $errorMsg;
   }
 }
-?>
+?>
\ No newline at end of file