This article explains why email spoofing is possible and how SMTP lacks built-in sender authentication, making the visible From header easy to fake. It also breaks down how SPF, DKIM, and DMARC work together, and why DMARC alignment is the only check that protects the sender address a person actually sees. #SMTP #SPF #DKIM #DMARC
Keypoints
- Email was never designed to verify who sent a message.
- SPF checks the sending server against the envelope sender’s domain.
- DKIM verifies a cryptographic signature and message integrity.
- SPF and DKIM can pass even when the visible From header is fake.
- DMARC enforces alignment with the From header and defines what to do on failure.
Read More: https://www.decodedsecurity.com/p/anyone-can-send-an-email-as-your