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.