diff --git a/defaults/main.yml b/defaults/main.yml
index 5fc1fb7..d36430d 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -50,7 +50,7 @@ postfix_config:
   mailbox_size_limit: 0
   mydestination: "{{ mail_server_fqdn }}; localhost; localhost.localdomain"
   myhostname: "{{ mail_server_fqdn }}"
-  mynetworks: "127.0.0.0/8 /etc/postfix/allowed_clients{% if mail_own_networks %}{% for ip in mail_own_networks %} {{ ip }}{% endfor %}{% endif %}"
+  mynetworks: "127.0.0.0/8 hash:/etc/postfix/allowed_clients{% if mail_own_networks %}{% for ip in mail_own_networks %} {{ ip }}{% endfor %}{% endif %}"
   myorigin: /etc/mailname
   policy-spf_time_limit: 3600s
   proxy_read_maps: $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks $virtual_mailbox_limit_maps
diff --git a/files/update_clients.sh b/files/update_clients.sh
index ff43e31..ecef04b 100644
--- a/files/update_clients.sh
+++ b/files/update_clients.sh
@@ -11,5 +11,5 @@ postmap /etc/postfix/allowed_clients
 for client in "${clients[@]}"
 do
     client_ip=$(dig "${client}" | grep -v '^;' |grep "\sA\s" | awk '{print($5)}')
-    echo "${client_ip}" >> /etc/postfix/allowed_clients
+    echo "${client_ip} OK" >> /etc/postfix/allowed_clients
 done