diff --git a/manifests/init.pp b/manifests/init.pp
index 272e2be..4781715 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -2,6 +2,7 @@ class exim(
   $mailman_domains = [],
   $queue_interval = '30m',
   $queue_run_max = '5',
+  $queue_smtp_domains = '',
   $sysadmin = []
 ) {