In This Guide
Email authentication protocols
SPF, DKIM, DMARC
SPF specifies authorized sending servers preventing spoofing. DKIM signs messages cryptographically proving authenticity. DMARC defines policy for messages failing authentication. Proper implementation prevents domain impersonation. Regular monitoring identifies unauthorized sending attempts. Gradual enforcement rollout prevents legitimate mail disruption.
Two-factor authentication implementation
MFA requirements
Authenticator apps provide secure second factor. SMS backup for users without smartphones. Conditional access policies require MFA for external access. Trusted devices reduce friction for regular access. Recovery methods prevent lockout. User training ensures adoption. Regular audits identify non-compliant accounts.
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Encryption and transport security
Protection frameworks
TLS encryption protects messages in transit. S/MIME or PGP for end-to-end encryption. Certificate management for secure connections. Modern authentication protocols replacing legacy. App passwords for legacy applications. Conditional access blocking insecure clients.
Phishing prevention
User education
Regular phishing simulation testing. Security awareness training identifying threats. Email filtering catching suspicious messages. Link protection rewriting URLs for scanning. Attachment sandboxing analyzing files. Reporting mechanisms for suspicious emails. Incident response procedures.
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