Used as one method of filtering spam, blacklists provide a list of known sources of unwanted e-mail. Traffic from listed IP addresses is simply blocked. Several public blacklists are available, one of the best known being the Mail Abuse Prevention System [MAPS].

The use of blacklists helps to force ISPs [Internet Service Providers] to monitor their own outgoing e-mail and so avoid the negative commercial effects of being ‘blacklisted’.

Read more:

• About spam
• About Kaspersky Anti-Spam