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It’s necessary for webmasters and SEOs to periodically check if their websites are ‘clean.' This implies using a blacklist lookup tool to make sure the website has not been blacklisted. A blacklist in the internet world means that a website is suspected of distributing malware or spam emails. Spam and malware filters identify these sites, and any outgoing content from them is either blocked, or the email is placed in the recipient’s spam mail.
It’s estimated that eighty percent of emails that are generated and sent across the internet are spam emails. Hackers are relentlessly trying to break into sites that contain sensitive information. Once discovered, the sites that they have used to conduct these break-ins are blacklisted.