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Hey there! Unfortunately there is not currently a way to mark links as disavowed in Moz tools. Generally Spam Score should be used a guideline to investigate potential penalization issues rather than a concrete checklist. If you know that you've worked on your harmful backlinks, you can usually ignore that warning! Learn more about Spam score with the following articles: Spam Score: Moz's New Metric to Measure Penalization Risk Understanding and Applying Moz's Spam Score Metric - Whiteboard Friday