Дано: таблица подлых спамеров
checkhelo_blacklist.

Задача:
 занести список спамеров, имеющих кучу smtp серверов.


INSERT INTO checkhelo_blacklist (Helo,Comment,Disabled) VALUES ('smtp1.usndr.com','spam',0);
...................
INSERT INTO checkhelo_blacklist (Helo,Comment,Disabled) VALUES ('smtp501.usndr.com','spam',0);


Вопрос: как организовать цикл?
Спасибо.

# Select and compare the number of tracking HELOs in the past time with the blacklisted ones
		$sth = DBSelect("
			SELECT
				Count(*) AS Count

			FROM
				checkhelo_tracking, checkhelo_blacklist

			WHERE
				checkhelo_tracking.LastUpdate >= ".DBQuote($start)."
				AND checkhelo_tracking.Address = ".DBQuote($sessionData->{'ClientAddress'})."
				AND checkhelo_tracking.Helo = checkhelo_blacklist.Helo
				AND checkhelo_blacklist.Disabled = 0
		");