diff --git a/data/helpers.d/backend b/data/helpers.d/backend
index 28c5b8e91..8dce2df06 100644
--- a/data/helpers.d/backend
+++ b/data/helpers.d/backend
@@ -117,7 +117,10 @@ ynh_remove_systemd_config () {
 
 # Create a dedicated nginx config
 #
-# usage: ynh_add_nginx_config
+# usage: ynh_add_nginx_config "list of others variables to replace"
+#
+# | arg: list of others variables to replace separeted by a space
+# |      for example : 'path_2 port_2 ...'
 #
 # This will use a template in ../conf/nginx.conf
 #   __PATH__      by  $path_url
@@ -126,8 +129,13 @@ ynh_remove_systemd_config () {
 #   __NAME__      by  $app
 #   __FINALPATH__ by  $final_path
 #
+#  And dynamic variables (from the last example) :
+#   __PATH_2__    by $path_2
+#   __PORT_2__    by $port_2
+#
 ynh_add_nginx_config () {
 	finalnginxconf="/etc/nginx/conf.d/$domain.d/$app.conf"
+	local others_var=${1:-}
 	ynh_backup_if_checksum_is_different "$finalnginxconf"
 	sudo cp ../conf/nginx.conf "$finalnginxconf"
 
@@ -151,6 +159,22 @@ ynh_add_nginx_config () {
 	if test -n "${final_path:-}"; then
 		ynh_replace_string "__FINALPATH__" "$final_path" "$finalnginxconf"
 	fi
+
+	# Replace all other variable given as arguments
+	for var_to_replace in $others_var
+	do
+		# ${var_to_replace^^} make the content of the variable on upper-cases
+		# ${!var_to_replace} get the content of the variable named $var_to_replace 
+		ynh_replace_string "__${var_to_replace^^}__" "${!var_to_replace}" "$finalnginxconf"
+	done
+	
+	if [ "${path_url:-}" != "/" ]
+	then
+		ynh_replace_string "^#sub_path_only" "" "$finalnginxconf"
+	else
+		ynh_replace_string "^#root_path_only" "" "$finalnginxconf"
+	fi
+
 	ynh_store_file_checksum "$finalnginxconf"
 
 	sudo systemctl reload nginx
diff --git a/data/helpers.d/package b/data/helpers.d/package
index a1d29651e..71771a568 100644
--- a/data/helpers.d/package
+++ b/data/helpers.d/package
@@ -101,6 +101,10 @@ ynh_package_install_from_equivs () {
 
     # Build and install the package
     local TMPDIR=$(mktemp -d)
+
+    # Force the compatibility level at 10, levels below are deprecated 
+    echo 10 > /usr/share/equivs/template/debian/compat
+
     # Note that the cd executes into a sub shell
     # Create a fake deb package with equivs-build and the given control file
     # Install the fake package without its dependencies with dpkg
diff --git a/data/templates/postfix/main.cf b/data/templates/postfix/main.cf
index bdd364250..7d7589c66 100644
--- a/data/templates/postfix/main.cf
+++ b/data/templates/postfix/main.cf
@@ -45,6 +45,11 @@ smtp_tls_exclude_ciphers = $smtpd_tls_exclude_ciphers
 smtp_tls_mandatory_ciphers= $smtpd_tls_mandatory_ciphers
 smtp_tls_loglevel=1
 
+# Configure Root CA certificates
+# (for example, avoids getting "Untrusted TLS connection established to" messages in logs)
+smtpd_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
+smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
+
 # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
 # information on enabling SSL in the smtp client.