What are blacklists, whitelists and graylists?

They are 3 methods of defending against spam or inappropriate usage. All work by analyzing the IP Address of the connecting host.
Blacklist IP addresses are rejected by default, as they are considered inappropriate.
Whitelist IP addresses are validated by default, as they are considered as 100% safe.
Graylist IP addresses will be temporarily placed in a “to validate” state. This allows for active control and fraud detection.

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