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A website might get on a blacklist if the website owner set to transport emails promoting a brand new product to thousands of individuals. If one or a number of the receivers of the mail marks it as spam, the e-mail service supplier may place the website on a blacklist. during a totally different state of affairs, if you see that your regular website} guests have born off and also the traffic to your site has stopped; one amongst the explanations might be that your website has been blacklisted. conjointly if somebody is giving to sell a website to you; you want to check and see if that domain is blacklisted or not.
Some organizations area unit running the blacklist service on the net. Email service suppliers check if a website is blacklisted with DNSBL or SURBL. Email service suppliers use these services to do and eliminate spam mail before it reaches the user. Some DNSBL service suppliers use a spread of criteria to list and delist website addresses. Spam filters employed by email service suppliers use DNSBL services because of the initial line of defense. SURBL isn't the primary line of defense in checking spam mail. It contains a directory of internet sites that are blacklisted for showing within the text of spam emails. each these ways area unit employed by email service suppliers as their initial line of defense against spam mail.