Fix so additional headers are added to all messages sent (#1489284)

Aleksander Machniak

2013-08-25 6efadfc8d38730f3ee6d0bbcd53bdc24ef094116

 program/steps/mail/sendmail.inc

@@ -455,6 +455,7 @@
}

// exec hook for header checking and manipulation
// Depracated: use message_before_send hook instead
$data = $RCMAIL->plugins->exec_hook('message_outgoing_headers', array('headers' => $headers));

// sending aborted by plugin