diff --git a/booking.MailSystemInterface.inc b/booking.MailSystemInterface.inc
index 5c47cf9..3a47793 100644
--- a/booking.MailSystemInterface.inc
+++ b/booking.MailSystemInterface.inc
@@ -15,6 +15,7 @@ class BookingMailSystem implements MailSystemInterface {
    */  
   public function format(array $message) {
     $message['body'] = implode("\n\n", $message['body']);
+    watchdog('booking_debug', "<pre>BookingMailSystem format:\n@info</pre>", array('@info' => print_r( $message, true)));
     return $message;
   }
  
@@ -32,11 +33,13 @@ class BookingMailSystem implements MailSystemInterface {
       $mimeheaders[] = $name . ': ' . mime_header_encode($value);
     }   
     $line_endings = variable_get('mail_line_endings', MAIL_LINE_ENDINGS);
-    return mail(
+    $mail = mail(
       $message['to'],
       mime_header_encode($message['subject']),
       preg_replace('@\r?\n@', $line_endings, $message['body']),
       join("\n", $mimeheaders)
     );
+    watchdog('booking_debug', "<pre>BookingMailSystem mail:\n@info</pre>", array('@info' => print_r( $mail, true)));
+    return $mail;
   }
 }
\ No newline at end of file