How can DMARC reduce fake “from yourself” ransom emails?

Some ransom emails spoof the victim's own address, claiming "I have access to your account" and appearing to send from the recipient's email. DMARC enforcement can block these spoofed messages.

Mechanism: with **DMARC** quarantine or reject policy, messages claiming to be from your domain but sent from unauthorized infrastructure are blocked. The fake "from yourself" message never reaches the inbox.

Limitation: only works if you have **DMARC** enforcement on your domain. Many users with personal email addresses on domains without **DMARC** still receive these spoofed messages. Domain owners should implement **DMARC**.