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There are thousands of databases on the internet that maintain lists of‘ abusive hosts’. Email service providers and ISPs look at these lists to protect their users from potential malware, viruses, or other nasty stuff.
There are so many blacklist website lists that it becomes virtually impossible for a website owner to check if his or her website is listed on any of the websites. Therefore you need to use a tool to check if your website is on any blacklist. If it is so, you must take measures to have it removed from the list. You can use Google analytical tools to check the Google blacklist list.