1. SPF (Sender Policy Framework)
2. DMARC (Domain-based Message Authentication, Reporting and Conformance)
3. S/MIME (Secure/Multipurpose Internet Mail Extensions)
4. STARTTLS (START Transport Layer Security)
5. TLS (Transport Layer Security)
6. PGP (Pretty Good Privacy)
7. ARC (Authenticated Received Chain)
8. DANE (DNS-Based Authentication of Named Entities)

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