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A website could get on a blacklist if the website owner decided to send out emails promoting a new product to thousands of people. If one or some of the receivers of the mail marks it as spam, the email service provider might place the website on a blacklist. In a different scenario, if you see that your regular site visitors have dropped off and the traffic to your site has stopped; one of the reasons could be that your website has been blacklisted. Also if someone is offering to sell a domain to you; you must check and see if that domain is blacklisted or not.
