diff --git a/defaults/main.yml b/defaults/main.yml
index 8bbaef3..c2ca67a 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -13,3 +13,4 @@ im_workers: 4
 im_http_listen: 'localhost'
 im_http_port: 80
 im_admin_email: root@localhost
+im_mail_server: 'localhost'