At the end of admin/process_email.php, fclose is called with $handle.

$handle is never opened, $fd is.

diff --git a/admin/process_email.php b/admin/process_email.php
index 33c8783..f07e8c9 100755
— a/admin/process_email.php
+++ b/admin/process_email.php
@@ -72,7 +72,7 @@ while(!feof($fd)) {

$function($modargs,$body);

-fclose($handle);
+fclose($fd);