"Short for Realtime Blackhole List (RBL) Or DNS-based Blackhole List "
(DNSBL) means that are used to distribute the addresses of computers or networks related to spamming. A DNSBL is list of IP addresses published through the Internet Domain Name Service in a particular format.
The DNSBL consists of a DNS based system containing lists of IP addresses whose owners refuse to stop the proliferation of spam whether this be by running their mail servers as open relays, or by allowing their dialup users free outbound access to port 25.
As subscribers to the DNSBL, ISPs and companies will know from which IP addresses to block traffic. Most traffic blocking occurs during the SMTP connection phase. The receiving end will check the DNSBL for the connecting IP address. If the IP address matches one on the list, then the connection gets dropped before accepting any traffic from the spammer.
Some ISPs, though, will choose to blackhole (or disallow) IP packets at their routers. The goal here is to block all IP traffic.
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