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DNS: The Single Source of Truth 11

• Specific DNS Providers (3)
• Checking consistency of DNS Servers
• Deliverability Advice Questions
• DMARC/DKIM NS Records: Why You Shouldn't Be Concerned
• Email authentication for multiple DNS views
• Legal Characters in DNS

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DMARC: The Gatekeeper 9

• What is DMARC?
• DMARC Alignment
• DMARC Aggregate Reports
• DKIM and SPF alignment: what it is, why it matters and how to fix it
• When to switch Enforcement policies

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SPF: Who Sent It? 6

• What is SPF?
• Valimail SPF Records
• SPF Flattening
• Working around Vendor Verification of SPF
• Trailing SPF Includes in Valimail Delegated Domains

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DKIM: Who Signed It? 4

• What is DKIM?
• How does DKIM work?
• What characters are permitted in a DKIM selector?
• Rotating DKIM keys

ARC: Who Forwarded It? 1

• What is ARC?