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This article may need to be rewritten to comply withWikipedia's quality standards. You can help....This article may need to be rewritten to comply withWikipedia's quality standards. You can help. The talk page may contain suggestions. (September 2019) ADomain Name Systemblocklist,Domain Name System-basedblackhole list,Domain Name Systemblacklist (DNSBL) or real-timeblackhole list (RBL) is a service for operation of mail servers to perform a check via aDomain Name System (DNS) query whe







