Try some new settings

dovecot.nix

@@ -352,7 +352,6 @@ in {
           passdb {
             driver = ldap
             args = ${cfg.ldap-conf}
-            username_format = %n
           }
 
           # All users map to one actual system user
@@ -361,6 +360,8 @@ in {
             args = uid=${
               toString mailUserUid
             } home=${cfg.state-directory}/mail/%u
+            user_attrs = =user=%{ldap:cn}
+            user_filter = (&(objectClass=organizationalPerson)(cn=%n))
           }
 
           service imap {

mail-server.nix

@@ -187,42 +187,6 @@ in {
           };
         };
       };
-
-      ## No...these ports were already open
-      # xinetd = {
-      #   enable = true;
-      #   services = let
-      #     genService = { name, port, protocols ? [ "tcp" ] }:
-      #       map (protocol: {
-      #         inherit name;
-      #         server = "/usr/bin/env";
-      #         extraConfig = "redirect = 127.0.0.1 ${toString port}";
-      #       }) protocols;
-      #   in concatMap genService [
-      #     {
-      #       name = "imap";
-      #       port = 9143;
-      #     }
-      #     {
-      #       name = "imaps";
-      #       port = 9993;
-      #     }
-      #     {
-      #       name = "smtp";
-      #       port = 9025;
-      #       protocols = [ "tcp" "udp" ];
-      #     }
-      #     {
-      #       name = "submission";
-      #       port = 9587;
-      #       protocols = [ "tcp" "udp" ];
-      #     }
-      #     {
-      #       name = "submissions";
-      #       port = 9465;
-      #     }
-      #   ];
-      # };
     };
 
     fudo.secrets.host-secrets."${hostname}" = {