diff --git a/postfix/defaults/main.yml b/postfix/defaults/main.yml
index 75039eaf70ffa628435b735033f40898b49f0ff9..6cbd8df0d7e9d25c023f8d446fb276d2c0ad47ea 100644
--- a/postfix/defaults/main.yml
+++ b/postfix/defaults/main.yml
@@ -41,3 +41,5 @@ postfix_transport_maps: []
 #    port: 2025
 #    protocol: smtp
 #    use_mx: true
+
+postfix_my_networks: []
diff --git a/postfix/templates/main.cf.j2 b/postfix/templates/main.cf.j2
index 1ff0c4e86c46a08492c3712441e03637821fe9b5..d078ddbc3d9eb3b0e01f54ba01eecb6dc97cbcea 100644
--- a/postfix/templates/main.cf.j2
+++ b/postfix/templates/main.cf.j2
@@ -5,7 +5,7 @@ inet_protocols = all
 myhostname = {{ ansible_fqdn }}
 myorigin = /etc/mailname
 mydestination = $myhostname localhost {{ postfix_domains | join(" ") }}
-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 {{ postfix_my_networks|join(" ") }}
 relayhost = {{ postfix_relay_host }}
 {% if postfix_transport_maps|bool %}
 transport_maps = cdb:/etc/postfix/transport