Email Dossier is a tool designed to assist in the investigation of email incidents by analyzing and validating email headers and providing detailed information about the origin, routing, and authenticity of an email. When Michael is tasked with handling an email incident and needs to check the validity of an email received from an unknown source, Email Dossier can be utilized to trace the email's path, assess its credibility, and identify potential red flags associated with phishing or other malicious email-based attacks.