diff --git a/templates/main.cf.j2 b/templates/main.cf.j2
index d67f909..d9c8741 100644
--- a/templates/main.cf.j2
+++ b/templates/main.cf.j2
@@ -8,7 +8,7 @@ alias_maps = hash:/etc/aliases
 alias_database = hash:/etc/aliases
 mydestination = $myhostname, localhost.$mydomain, localhost
 relayhost = [{{ postfix_relayhost }}]:{{ postfix_port }}
-mynetworks = 127.0.0.0/8
+mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
 inet_interfaces = loopback-only
 recipient_delimiter = +