{ "rules_redirect_to_logout_except_for_role_id3" : {
    "LABEL" : "Redirect to logout except for role ID3",
    "PLUGIN" : "reaction rule",
    "ACTIVE" : false,
    "OWNER" : "rules",
    "REQUIRES" : [ "rules" ],
    "ON" : { "user_login" : [] },
    "IF" : [
      { "NOT user_has_role" : { "account" : [ "account" ], "roles" : { "value" : { "3" : "3" } } } }
    ],
    "DO" : [
      { "mail" : {
          "to" : "[account:mail]",
          "subject" : "No login allowed",
          "message" : "You just completed a login to [site:name], located at [site:url].rnrnHowever, at this time we do not allow any login ...rnrnThanks anyway for validating some of your account data, such as your eMail ID.",
          "language" : [ "" ]
        }
      },
      { "redirect" : { "url" : "user/logout" } }
    ]
  }
}

/**
 * Implementation of hook_form_alter().
 */
function YOUR_MODULE_form_alter(&$form, $form_state, $form_id) {
    if ($form_id == 'user_login') {
       array_unshift($form['#validate'], 'YOUR_MODULE_login_form_validate');
    }
}

function YOUR_MODULE_login_form_validate($form, $form_state) {
    form_set_error('','Your user is not enabled to login');
}