diff --git a/salt/profile/discourse/files/discourse.conf b/salt/profile/discourse/files/discourse.conf
index 1331b36..9940e52 100644
--- a/salt/profile/discourse/files/discourse.conf
+++ b/salt/profile/discourse/files/discourse.conf
@@ -14,6 +14,9 @@ db_password = '{{ pillar['postgres']['users']['discourse']['password'] }}'
 # hostname running the forum
 hostname = {{ pillar['profile']['discourse']['hostname'] }}
 
+# address of smtp server used to send emails
+smtp_address = localhost
+
 # domain passed to smtp server
 smtp_domain = {{ pillar['profile']['discourse']['smtp_domain'] }}