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The blacklist check will show if the URL or IP entered is recorded with DNSBL or SURBL frameworks. These systems are utilized by email system administrators to try and eliminate spam email messages before they arrive at their users.
DNSBL is a Domain Name Blacklist. There are many DNSBLs online, all of which utilize a wide variety of criteria for posting and delisting addresses. Spam filters use different DNSBLs to check that the incoming emails don't originate from blacklisted sites. DNSBLs are commonly the first line of protection against spam.
SURBLs are commonly the second line of defense however not all spam filters are fit for utilizing them. SURBLs are blacklists of websites that have been noted for showing up in unsolicited emails. Spam filters that can use the SURBLs will scan the body content of emails and concentrate on any website addresses and check them against the blacklists. If an address is found, the message will be flagged as spam and handled accordingly.
Since both methods filter differently they are most effective when combined. Unfortunately, as spammers become increasingly cunning there isn’t a method that can get each spam message. It is interesting to note, given the strategies spammers use, that DNSBLs will in general change more frequently than SURBLs. If you’re an email system administrator and your server has been blacklisted, you should work with the different DNSBLs that may have you recorded or potentially SURBL.
The primary or let’s say the original utilization of domain blacklist check is to block mail. Most email servers nowadays have DNSBL support either built-in or a plug-in which enables a server administrator to block all emails from the domains or sites listed on a specific DNSBL. This could be an effort to minimize the amount of spam that users would be sent. More recently, DNSBLs have additionally been utilized as a part of a spam scoring system, for instance, SpamAssassin.
If you’ve made it on a spam blacklist that is additionally referenced in a spam scoring system, at that point, all things considered, your spam score could be expanded by some time. If that along with other scoring tests performed, results in a high score over a specific level, it could either be disposed or coordinated to the spam organizer.