diff --git a/roles/mail_server/tasks/main.yml b/roles/mail_server/tasks/main.yml
index 3d01ef702fd067a5a530ef264146e365bd2ec95f..5858871cbebeb0f76eea8af77f0dbea58ac8300f 100644
--- a/roles/mail_server/tasks/main.yml
+++ b/roles/mail_server/tasks/main.yml
@@ -59,6 +59,16 @@
   notify:
     - Restart Postfix
 
+- name: Generate the SMTP server Diffie-Helman parameter
+  openssl_dhparam:
+    owner: root
+    group: root
+    mode: 0640
+    path: "/etc/ssl/private/{{ ansible_fqdn }}_smtp.dh.pem"
+    size: 2048
+  notify:
+    - Restart Postfix
+
 - name: Deploy IMAP TLS private key
   copy:
     dest: "/etc/ssl/private/{{ ansible_fqdn }}_imap.key"