Imap::setIsOldStatusesLowerThan

protected function setIsOldStatusesLowerThan($internalDate, $dirPath, $mailboxId)
{
	if($internalDate === false)
	{
		return true;
	}

	$dirsHelper = new MailHelperMailboxDirectoryHelper($mailboxId);
	$dir = $dirsHelper->getDirByPath($dirPath);

	$entity = BitrixMailMailMessageUidTable::getEntity();
	$connection = $entity->getConnection();

	$where = sprintf(
		'(%s)',
		MainEntityQuery::buildFilterSql(
				$entity,
				[
					'<=INTERNALDATE' => $internalDate,
					'=DIR_MD5'	=>	$dir->getDirMd5(),
					'=MAILBOX_ID'	=>	$mailboxId,
					'!=IS_OLD' => 'Y',
				]
			)
		);

	$connection->query(sprintf(
		'UPDATE %s SET IS_OLD = "Y", IS_SEEN = "Y" WHERE %s LIMIT 1000',
		$connection->getSqlHelper()->quote($entity->getDbTableName()),
		$where
	));

	if($connection->getAffectedRowsCount() === 0)
	{
		return true;
	}
	else
	{
		return false;
	}
}