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SPAM Blackhole Lists: How Salesforce Email Delivery is Affected

Knowledge Article Number 000194163
Description Typically referred to as Blackhole Lists, Blocklists, or Blacklists, the infrastructure was created to mitigate mail abuse from spammers and phishers.  A DNSBL or RBL (Domain Name Service Blackhole List/Real-time Blackhole List) is a list of Internet Protocol Addresses published via the Internet Domain Name Service.  The list can be utilized by email administrators or receiving MTA's (email server) through a file or queried in real-time to block the delivery of email from IP Addresses.

Blacklist providers have their own proprietary methods around how they determine IP Addresses to be listed and de-listed.  There are no standards as to how Blacklist providers operate as a business.  In most cases, major reputable Blacklist providers such as Spamhaus, will work with ESP's (Email Service Providers) to de-list their legitimate IP Addresses.  There are however minor Blacklist providers that do not accept de-listing requests, or require the ESP to pay a monetary fee to be removed. 

Resolution Email Administrators/Email Providers should research and use major, reputable Blacklist providers that will work with legitimate ESP's to be de-listed.  In general, providers that will not work with ESP's for de-listing, or charge a monetary fee to be de-listed, should not be used at a enterprise production level. 

We have come across some minor providers such as Spamcannibal and Sorbs, who have not been receptive with working with ESP's.  Unfortunately, Salesforce cannot control what a recipient mail server utilizes; we can only suggest the mail provider pull from a reputable service.

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