{ ... }:{
  users = {
    groups."vmail" = {};
    users = {
      "vmail" = {
        isSystemUser = true;
        group = "vmail";
        home = "/var/spool/mail/vmail";
        createHome = true;
      };
      # Permissions to allow Postfix and Dovecot to read ACME certificates
      "postfix".extraGroups = [ "acme" ];
      "dovecot2".extraGroups = [ "acme" ];
    };
  };
}