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  1. Domain Name System blocklist - Wikipedia

    • A Domain Name System blocklist, Domain Name System-based blackhole list, Domain Name System blacklist (DNSBL) or real-time blackhole list (RBL) is a service for operation of mail servers to perform a check via a Domain Name System (DNS) query whether a sending host's IP address is blacklisted for email spam. Most mail server software can be configur… See more

    History

    The first DNSBL was the Real-time Blackhole List (RBL), created in 1997, at first as a Border Gateway Protocol (BGP) feed by
    The … See more

    Principle

    To operate a DNSBL requires three things: a domain to host it under, a nameserver for that domain, and a list of addresses to publish.
    It is possible to serve a DNSBL using any general-pur… See more

    Types

    In addition to the different types of listed entities (IP addresses for traditional DNSBLs, host and domain names for RHSBLs, URIs for URIBLs) there is a wide range of semantic variations between lists as to what … See more

    Usage

    • Most message transfer agents (MTA) can be configured to absolutely block or (less commonly) to accept email based on a DNSBL listing. This is the oldest usage form of DNSBLs. Depending on the specific MTA, ther… See more

    Criticism

    Some end-users and organizations have concerns regarding the concept of DNSBLs or the specifics of how they are created and used. Some of the criticisms include:
    • Legitimate emails blocked along with spam from share… See more

    Notable examples

    AHBL
    CBL
    NJABL
    SORBS – List of e-mail servers suspected of enabling spam
    DynablockSee more

     
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