diff --git a/sympa/resources/tools/sympa_import.bash b/sympa/resources/tools/sympa_import.bash
index b7b3534..12de18d 100755
--- a/sympa/resources/tools/sympa_import.bash
+++ b/sympa/resources/tools/sympa_import.bash
@@ -101,6 +101,46 @@ function import_certbot {
 		echo OK
 	fi
 
+	# add options-ssl-nginx.conf
+	if [[ ! -f /etc/letsencrypt/options-ssl-nginx.conf ]]; then
+		tee /etc/letsencrypt/options-ssl-nginx.conf <<EOF
+# This file contains important security parameters. If you modify this file
+# manually, Certbot will be unable to automatically provide future security
+# updates. Instead, Certbot will print and log an error message with a path to
+# the up-to-date file that you will need to refer to when manually updating
+# this file. Contents are based on https://ssl-config.mozilla.org
+
+ssl_session_cache shared:le_nginx_SSL:10m;
+ssl_session_timeout 1440m;
+ssl_session_tickets off;
+
+ssl_protocols TLSv1.2 TLSv1.3;
+ssl_prefer_server_ciphers off;
+
+ssl_ciphers "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384";
+EOF
+		echo 'options-ssl-nginx.conf created!'
+	else
+		echo 'options-ssl-nginx.conf already there!'
+	fi
+
+	# add ssl-dhparams.pem
+	if [[ ! -f /etc/letsencrypt/ssl-dhparams.pem ]]; then
+		tee /etc/letsencrypt/ssl-dhparams.pem <<EOF
+-----BEGIN DH PARAMETERS-----
+MIIBCAKCAQEA//////////+t+FRYortKmq/cViAnPTzx2LnFg84tNpWp4TZBFGQz
++8yTnc4kmz75fS/jY2MMddj2gbICrsRhetPfHtXV/WVhJDP1H18GbtCFY2VVPe0a
+87VXE15/V8k1mE8McODmi3fipona8+/och3xWKE2rec1MKzKT0g6eXq8CrGCsyT7
+YdEIqUuyyOP7uWrat2DX9GgdT0Kj3jlN9K5W7edjcrsZCwenyO4KbXCeAvzhzffi
+7MA0BM0oNC9hkXL+nOmFg/+OTxIy7vKBg8P+OxtMb61zO7X8vC7CIAXFjvGDfRaD
+ssbzSibBsu/6iGtCOGEoXJf//////////wIBAg==
+-----END DH PARAMETERS-----
+EOF
+		echo 'ssl-dhparams.pem created!'
+	else
+		echo 'ssl-dhparams.pem already there!'
+	fi
+
 	# change nginx
 	if ! grep -Pq '^\s+listen 443' /etc/nginx/sites-enabled/sympa.conf; then
 		tee /etc/nginx/sites-available/sympa.conf <<EOF
@@ -114,8 +154,10 @@ server {
     listen 443;
     server_name _;
 
-    ssl_certificate     /etc/letsencrypt/live/\$host/cert.pem;
+    ssl_certificate     /etc/letsencrypt/live/\$host/fullchain.pem;
     ssl_certificate_key /etc/letsencrypt/live/\$host/privkey.pem;  
+    include /etc/letsencrypt/options-ssl-nginx.conf;
+    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
 
     rewrite ^/$ /wws permanent;
 
@@ -138,7 +180,8 @@ server {
     }
 }
 EOF
-		nginx -t && systemctl reload nginx
+		nginx -t
+		systemctl reload nginx
 		echo host for nginx installed successfully!
 	else
 		echo host SSL nginx already activated!