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Hi Jaume! Spam Score works by considering 17 different factors that are frequently present on sites that have received spam penalties. Each site is given a number based on how many of those factors are present. Most sites have at least one or two of those factors, and many sites have several of them without ever receiving a penalty. The more flags a site has, though, the greater the likelihood that it could receive a penalty. You can read more about how Spam Score works here.