Distributed Sender Blackhole List
（重定向自DSBL）
The Distributed Sender Blackhole List was a DNSBL 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.