Cisco CloudCenter: Get the Hybrid IT Advantage

Right-Hand Side Blacklist (RHSBL)

Definition - What does Right-Hand Side Blacklist (RHSBL) 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.

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 (RHSBL)

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.

Share this:

Connect with us

Email Newsletter

Join thousands of others with our weekly newsletter

The 4th Era of IT Infrastructure: Superconverged Systems
The 4th Era of IT Infrastructure: Superconverged Systems:
Learn the benefits and limitations of the 3 generations of IT infrastructure – siloed, converged and hyperconverged – and discover how the 4th...
Approaches and Benefits of Network Virtualization
Approaches and Benefits of Network Virtualization:
Businesses today aspire to achieve a software-defined datacenter (SDDC) to enhance business agility and reduce operational complexity. However, the...
Free E-Book: Public Cloud Guide
Free E-Book: Public Cloud Guide:
This white paper is for leaders of Operations, Engineering, or Infrastructure teams who are creating or executing an IT roadmap.
Free Tool: Virtual Health Monitor
Free Tool: Virtual Health Monitor:
Virtual Health Monitor is a free virtualization monitoring and reporting tool for VMware, Hyper-V, RHEV, and XenServer environments.
Free 30 Day Trial – Turbonomic
Free 30 Day Trial – Turbonomic:
Turbonomic delivers an autonomic platform where virtual and cloud environments self-manage in real-time to assure application performance.