diff --git a/group_vars/zabbix-server.yml b/group_vars/zabbix-server.yml
index 7d0be6b..63b9ec6 100644
--- a/group_vars/zabbix-server.yml
+++ b/group_vars/zabbix-server.yml
@@ -5,4 +5,5 @@ pg_hba_extra:
   user: zabbix
   address: ''
   method: md5
-smtp_mynetworks: localhost
+smtp_mynetworks:
+- localhost