diff --git a/roles/mail_server/templates/99-local.conf.j2 b/roles/mail_server/templates/99-local.conf.j2
index c5239bce6f8aae8a7d7fd5e8f023120f8ef0314b..0f91c09f199b9c05dfb8ef7c30cfc6efe1553431 100644
--- a/roles/mail_server/templates/99-local.conf.j2
+++ b/roles/mail_server/templates/99-local.conf.j2
@@ -31,13 +31,7 @@ service auth {
 # TLS configuration.
 ssl_cert = </etc/ssl/certs/{{ ansible_fqdn }}_imap.pem
 ssl_key = </etc/ssl/private/{{ ansible_fqdn }}_imap.key
-{% if ansible_distribution_release == "stretch" %}
-ssl_dh_parameters_length = 2048
-{% elif ansible_distribution_release == "buster" %}
 ssl_dh=</etc/ssl/private/{{ inventory_hostname }}_imap.dh.pem
-{% else %}
-{{ unsupported_distribution_release }}
-{% endif %}
 ssl_protocols = {{ mail_server_tls_protocols | join(' ') }}
 ssl_cipher_list = {{ mail_server_tls_ciphers }}
 ssl = required