[Postfix] Set mynetworks_style = subnet to include all local subnets, will be overridden by mynetworks in extra.cf

data/conf/postfix/main.cf

@@ -15,7 +15,7 @@ smtpd_relay_restrictions = permit_mynetworks,
 alias_maps = hash:/etc/aliases
 alias_database = hash:/etc/aliases
 relayhost =
-mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 [fe80::]/10 [fc00::]/7
+mynetworks_style = subnet
 mailbox_size_limit = 0
 recipient_delimiter = +
 inet_interfaces = all
@@ -198,4 +198,3 @@ parent_domain_matches_subdomains = debug_peer_list,fast_flush_domains,mynetworks
 
 # DO NOT EDIT ANYTHING BELOW #
 # User overrides #
-