public static function findByEmail($strEmail, array $arrOptions = [])
	{
		$time = time();
		$t    = static::$strTable;

		$arrColumns = ["LOWER($t.email)=? AND ($t.start='' OR $t.start<$time) AND ($t.stop='' OR $t.stop>$time)"];

		return static::findOneBy($arrColumns, [$strEmail], $arrOptions);
	}