How can DMARC alignment reduce domain impersonation?
DMARC alignment ensures the domain in the visible From header matches the domain authenticated by SPF or DKIM. Without alignment, attackers could authenticate their own domain while spoofing yours in the From header.
Alignment prevents exact domain spoofing. Messages claiming From: ceo@company.com must authenticate as company.com to pass DMARC. Attackers can't use their own infrastructure to send as your domain.
Limitations: DMARC doesn't prevent lookalike domains (attacker owns c0mpany.com), display name spoofing (fake name, different address), or subdomain abuse without proper sp= policy. Alignment is essential but not complete protection.
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