A Composite Blocking List (CBL) is a data set used in email filtering and anti-spam solutions to block or filter out emails that are likely to be spam or malicious. It is essentially a collection of IP addresses or domains that have been identified as sources of undesirable or abusive email behavior, such as sending spam, phishing attempts, or malware. CBLs are often used by email service providers, organizations, and IT departments to enhance their email security.
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