diff --git a/mailcow/src/mailcow-dockerized/data/conf/postfix/main.cf b/mailcow/src/mailcow-dockerized/data/conf/postfix/main.cf
index a445b60..16dfd14 100644
--- a/mailcow/src/mailcow-dockerized/data/conf/postfix/main.cf
+++ b/mailcow/src/mailcow-dockerized/data/conf/postfix/main.cf
@@ -15,7 +15,7 @@
 alias_maps = hash:/etc/aliases
 alias_database = hash:/etc/aliases
 relayhost =
-mynetworks_style = subnet
+mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 172.22.1.0/24 [fe80::]/10 [fc00::]/7
 mailbox_size_limit = 0
 recipient_delimiter = +
 inet_interfaces = all