And Cisco is seeing and blocking only a portion of the world’s spam. On any given day, Cisco observes between 300 and 400 billion spam messages transmitted. Cisco reports that 80 to 85 percent of all email sent in the world is spam. Cisco’s Talos email reputation system combs through billions of emails a day. Users may be surprised to learn just how much spam is being blocked. The RBL providers examine links in email messages and identify the Internet sources of this malicious material. RBLs are a big reason why Internet users are not buried beneath a daily avalanche of spam and the threats it spreads, which include malware, phishing attacks, and scams. I Don’t See That Much Spam! Where Does It Go and Why?

In this blog, we take a look at the these often-unseen but indispensable systems. It is likely every type of entity relies on RBLs, including companies, governments, nongovernmental organizations (NGOs), mobile networks, Internet service providers, email service providers, and social networking sites.

During that time, they have been one of the most widely deployed and effective security solutions on the Internet. Reputation Block Lists are ubiquitous, and are a proven way to protect Internet users. With these RBLs, accuracy is a priority RBLs have an obvious interest in the reliability and quality of their work – if a list is not acceptably accurate and trustworthy, no one will use it. But well-run RBLs typically have well-defined criteria for listing an identifier as a threat as well as the process for removing it from the list. The lists vary in focus and in detection methods, and many lists specialize in one kind of threat. RBLs are created and maintained by commercial service providers, researchers, and public interest communities that operate the means to detect or receive notification of security threats. For example, some security systems ensure all traffic that arrives from a blocklisted IP address or all requests that match a blocklisted domain name or URL are rejected or quarantined. Security systems throughout the Internet examine traffic constantly to try to keep harmful material from reaching victims. RBLs are lists of domain names, Universal Resource Locators (URLs), and/or Internet Protocol (IP) addresses that have been investigated and subsequently identified as posing security threats. RBLs are built into the Internet services we all use every day to keep harmful material out of your email inbox, warn you away from phishing attempts, keep viruses off your organization’s network, and more. What many Internet users don’t know is that the vast majority of users are being protected all the time by Reputation Block Lists (RBLs).

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