diff --git a/roles/smtpgateway/templates/main.cf b/roles/smtpgateway/templates/main.cf
index 022fc7c..85b21bb 100644
--- a/roles/smtpgateway/templates/main.cf
+++ b/roles/smtpgateway/templates/main.cf
@@ -26,7 +26,7 @@ alias_database = hash:/etc/aliases
 myorigin = /etc/mailname
 mydestination = {{ansible_hostname}}.{{external_domain}}, $myhostname, {{ansible_hostname}}, localhost.localdomain, localhost
 relayhost = [{{postfix_relayhost}}]
-mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
+mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 {{ansible_default_ipv4.network}}/24
 mailbox_size_limit = 0
 recipient_delimiter = +
 inet_interfaces = all