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function wp_authenticate_spam_check( $user ) {
  if ( $user instanceof WP_User && is_multisite() ) {
    
/**
 * Filters whether the user has been marked as a spammer.
 *
 * @since 3.7.0
 *
 * @param bool    $spammed Whether the user is considered a spammer.
 * @param WP_User $user    User to check against.
 */
    $spammed = apply_filters( 'check_is_user_spammed', is_user_spammy( $user ), $user );

    if ( $spammed ) {
      return new WP_Error( 'spammer_account', __( '<strong>Error:</strong> Your account has been marked as a spammer.' ) );
    }
  }
  return $user;
}