What is a blocklist?

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What is a blocklist?

It is a database containing IP addresses, domains, or hashes. These lists are compiled by specialist research teams, who have observed the listed internet resources to either be:

1. Directly involved in malicious behavior, e.g., sending spam, distributing malware, hosting botnets, hosting phishing websites, etc., or
2. Having a bad reputation associated with them.

Presented in a DNS zone, blocklists can be utilized by anyone managing their own email infrastructure to filter potentially malicious emails.

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