From the original article: "This question should interest every entrepreneur and someone who is active in one way or another on social media. These different options will give you the necessary support. [note mg]
Imagine that you’ve spent years building a business and growing a website. You launch a promotion to email a list of potential customers with exciting new opportunities to save lots of money by doing business with you. Did you email too many people, or did you email the wrong people? Did someone turn you in as a “spammer” to one of the many spammer blacklist organizations out there?
Everyone hates real spammers, and the last thing you want to do is get labeled as one. That’s one kind of blacklist. The other kind is worse – the search engine blacklist. That’s the one that is basically a death sentence for your site because Google and other search engines stop crawling your site or even listing it in search results. No blacklist is good to get, because ISP’s and many content filtering services access Internet blacklists to figure out not only what email to block, but also what websites to block or to mark as potentially dangerous.
How do you know you’re on the Google List or any other database of blacklisted sites?"
Via Martin Gysler