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Delisting guide

Blocklists & Spam Monitoring

HIL Blacklist: Email Blocklist Removal Guide

Alaa 15 July 2026

Formerly a sender certification and reputation list from Habeas (acquired by Return Path). Discontinued when Return Path moved to different certification models.

Blocklists & Spam Monitoring

RATS Blacklists: Email Blocklist Removal Guide

Alaa 15 July 2026

Family of IP blocklists covering dynamic IPs (RATS-Dyna), confirmed spam sources (RATS-Spam), and IPs with no PTR record (RATS-NoPtr). Used in SpamAssassin and Postfix configurations.