Sendmarc Lookalike Domain Defense is a domain monitoring service that provides organizations with visibility into lookalike domains — domains that closely resemble a company's legitimate domain and are registered by threat actors for malicious purposes. The tool identifies existing lookalike domain registrations and monitors for new domain permutations as they are created. It checks whether discovered lookalike domains have an active web presence or email-sending capability, which helps organizations assess the threat level posed by each domain. Key risks addressed include: - Brand impersonation via fake websites or phishing/spoofing emails - Data theft through deceptive lookalike sites that harvest credentials or PII - Reputational damage from unauthorized use of a company's brand name - Financial losses from fraudulent activity conducted under a lookalike identity - System compromise through malware or ransomware distributed via lookalike sites The product provides a dashboard for managing discovered domains and supports a watchlist feature to track known lookalike domains over time. Alerts are issued when new domain permutations matching the organization's domain are registered.