What types of lists are utilized in anti-spam solutions? Choose two.

The selection of DNS Blacklists and RBLs as the correct answer highlights two critical mechanisms that anti-spam solutions employ to filter out unwanted emails.

DNS Blacklists are lists maintained by various organizations or companies that identify IP addresses known to send spam. By checking incoming email sources against these blacklists, spam filters can effectively block messages from these identified sources before they reach the inbox. This functionality is crucial in mitigating spam and protecting users from potentially harmful content.

RBLs, or Real-time Blackhole Lists, serve a similar purpose. They provide lists of IP addresses that have been determined to be sources of spam. Since RBLs are updated in real-time, they allow for a dynamic and proactive approach to spam filtering. By leveraging these blacklists, anti-spam solutions can enhance their accuracy in identifying unsolicited emails.

Together, DNS Blacklists and RBLs are fundamental tools in the battle against email spam, as they enable systems to react swiftly to known spam-facilitating addresses, safeguarding users from attacks and malicious content.