A DNSBL is a software mechanism, rather than a specific list or policy.

There are dozens of DNSBLs in existence, which use a wide array of criteria for listing and delisting of addresses.

These may include listing the addresses of zombie computers or other machines being used to send spam, Internet service providers (ISPs) who willingly host spammers, or those which have sent spam to a honeypot system.

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In 2003, a number of DNSBLs came under denial-of-service attacks (DOS).

Since no party has admitted to these attacks nor been discovered responsible, their purpose is a matter of speculation.

Before an address would be listed on the RBL, volunteers and MAPS staff would attempt repeatedly to contact the persons responsible for it and get its problems corrected.