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A website could be blacklisted if the website owner decides to send emails promoting a new product to thousands of people. If one or more of the recipients of the email marks it as spam, the website may be blacklisted by the email service provider.
In a different scenario, if you see that regular visitors to your site have stopped and traffic to your site has stopped; One of the reasons could be that your website has been blacklisted. Also, if someone offers to sell you a domain; you should check and see if that domain is registered. blacklisted or not.
