diff --git a/roles/postfix_null/tasks/main.yml b/roles/postfix_null/tasks/main.yml
index 91d08dd64eefd1d22f81e5b1be1be0964a65516d..15f3f5eaac9669e07cf37b445bb4c43a1f3c00f9 100644
--- a/roles/postfix_null/tasks/main.yml
+++ b/roles/postfix_null/tasks/main.yml
@@ -15,7 +15,7 @@
     name: "{{ inventory_hostname_short }}"
     comment: "SMTP Relay Account for {{ inventory_hostname }}"
     group: nobody
-    password: "{{ postfix_relay_password | password_hash('sha512') }}"
+    password: "{{ postfix_relay_password | password_hash('sha512', rounds=5000) }}"
     shell: /sbin/nologin
     update_password: always
     home: /home/"{{ inventory_hostname }}"  # Set home directory so shadow.service does not fail