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Hi there! Our machine learning model identified 27 common features among the millions of banned or penalized sites in the data we fed it. 8. Phone Number Present Spam sites rarely have real phone numbers present on their pages.    10. Email Address Present Email addresses are almost never present on spam sites.  It's recommended to have these but it doesn't explicitly it needs to be on the contact page. You can read more about Spam Score on our Help Hub - including an awesome video that explains how to use the score as well as the factors we use to calculate the score. If you have any further questions, please email us at help@moz.com.