feat: stalwart proxy with ldap directory

system/modules/mail-server/default.nix

@@ -7,6 +7,11 @@ with lib;
 {
   options.mail-server = {
     enable = mkEnableOption "mail-server";
+
+    configureACME = mkEnableOption "Enable auto configuration of ACME" // {
+      default = false;
+    };
+
     caFile = mkOption {
       type = types.path;
       default = config.security.pki.caBundle;

system/modules/mail-server/server.nix

@@ -34,7 +34,7 @@ let
 in
 {
   config = mkIf cfg.enable {
-    security.acme.certs = {
+    security.acme.certs = mkIf cfg.configureACME {
       "${config.services.postfix.settings.main.myhostname}" = {
         dnsProvider = null;
         webroot = "/var/lib/acme/acme-challenge";