SPF, DKIM, and DMARC
Three email authentication standards that prevent spoofing and phishing. SPF (Sender Policy Framework) specifies which servers can send email for a domain via DNS TXT records. DKIM (DomainKeys Identified Mail) adds a cryptographic signature to verify message integrity. DMARC (Domain-based Message Authentication) ties SPF and DKIM together with reporting and policy enforcement. Failures can result in SMTP rejections.
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DNS Record Types
DNS
SMTP Relay
Email & SMTP
Bounce Rate (Email)
Email & SMTP
Email Deliverability
Email & SMTP
Greylisting
Email & SMTP
Backscatter
Email & SMTP
Envelope vs Header
Email & SMTP
ARC (Authenticated Received Chain)
Email & SMTP
BIMI (Brand Indicators for Message Identification)
Email & SMTP