Learn Email Authentication
From DMARC basics to advanced email security protocols — everything you need to protect your domain and improve deliverability.
Core Concepts
Foundational email authentication protocols every domain owner should understand.
What is DMARC?
Learn how DMARC protects your domain from email spoofing and phishing attacks with policy-based authentication.
Core ConceptWhat is SPF?
Understand Sender Policy Framework (SPF) and how it authorizes mail servers to send email on behalf of your domain.
Core ConceptWhat is DKIM?
Learn how DomainKeys Identified Mail (DKIM) uses cryptographic signatures to verify email authenticity.
Core ConceptDMARC Aggregate Reports Explained
Understand DMARC aggregate (RUA) reports — what they contain, how to read them, and why they matter for email security.
Core ConceptDMARC Forensic Reports Explained
Learn about DMARC forensic (RUF) reports — detailed failure reports that help investigate individual authentication failures.
Core ConceptDMARC Alignment Explained
Understand DMARC alignment — how SPF and DKIM domain alignment determines whether emails pass DMARC checks.
Core ConceptWhat is BIMI?
Learn how Brand Indicators for Message Identification (BIMI) displays your brand logo in email inboxes.
Core ConceptWhat is TLS-RPT?
Understand TLS Reporting (TLS-RPT) and how it monitors the security of email transport encryption.
Core ConceptWhat is ARC?
Learn how Authenticated Received Chain (ARC) preserves email authentication results across forwarding hops.
Core ConceptWhat is MTA-STS?
Understand MTA Strict Transport Security (MTA-STS) and how it enforces TLS encryption for inbound email.
Core ConceptComparisons
Side-by-side breakdowns to help you understand when and why to use each protocol.
DMARC p=none vs p=reject: Which Policy Should You Use?
Compare DMARC policy options — understand when to use p=none for monitoring and when to enforce p=reject for protection.
ComparisonSPF vs DKIM: What's the Difference?
Understand the key differences between SPF and DKIM, and why you need both for complete email authentication.
ComparisonDMARC vs SPF: How They Work Together
Learn the difference between DMARC and SPF, and why DMARC builds on SPF to provide policy enforcement and reporting.
ComparisonDMARC Aggregate vs Forensic Reports
Compare DMARC aggregate (RUA) and forensic (RUF) reports — understand what each provides and when to use them.
ComparisonBIMI vs No BIMI: Is It Worth Implementing?
Evaluate the benefits of implementing BIMI for your domain — brand visibility, trust, and deliverability improvements.
Comparison