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Right-Hand Side Blacklist

What Does Right-Hand Side Blacklist Mean?

A right-hand side blacklist (RHSBL) is a listing that contains the domain names of spammers, which mail servers can be programmed to reject. RHSBL functions the same way as a domain name system blacklist (DNSBL) with one important distinction: RHSBLs include domain names rather than IP addresses.

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This type of blacklist gets its name due to the fact that the domain name in an email address appears to the right of the “@” sign.

Techopedia Explains Right-Hand Side Blacklist

Over the years, a number of DNSBLs have become vulnerable to denial-of-service (DoS) attacks. Those responsible for the attacks have not been uncovered, but many feel that spammers have been the ones to initiate them. In 2003, A DNSBL provider named Osirusoft was forced to shut down as a result of continuous DoS attacks. This outcome is likely to be exactly what those who perpetrate attacks against DNSBLs are hoping for.

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