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If the lists are available by DNS, how can the DNSBL software know that the queried named is listed or not ?

Well they would create one subdomain for each domain that would be considered as spam. So for example spammy.com.thelist.net, hammy.net.thelist.net etc. If one email comes from spammy.com, then the antispam software would have to lookup the spammy.com.thelist.net subdomain. If it exists, that means that the domain is listed as spam, if it doesn't exist, then the domain wasn't considered spam.

contact : @ychaouche yacinechaouche at yahoocom

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