Concept

Distributed Sender Blackhole List

Résumé
The Distributed Sender Blackhole List was a Domain Name System-based Blackhole List that listed IP addresses of insecure e-mail hosts. DSBL could be used by server administrators to tag or block e-mail messages that came from insecure servers, which is often spam. The DSBL published its lists as domain name system (DNS) zones that could be queried by anyone on the Internet. DSBL is a dead RBL as of May 2008. Its administrators continued to run their authoritative nameservers for several months after their decommissioning announcement; as of March 9, 2009, even those servers are offline. At this point, using any *.dsbl.org lookups in an RBL check results in DNS failures and can even prevent an SMTP server from starting a conversation. Blocking It is not possible for DSBL to block or intercept mail. E-mail is sometimes blocked or bounced with a message referencing DSBL. These messages were not blocked by DSBL; they were blocked by the a
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