Add DMARC setup documentation to deliverability section#77
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ZLeventer wants to merge 2075 commits into
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Add DMARC setup documentation to deliverability section#77ZLeventer wants to merge 2075 commits into
ZLeventer wants to merge 2075 commits into
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added 30 commits
August 13, 2025 23:14
DMARC is the third leg of email authentication (alongside SPF and DKIM) and has been required by Gmail and Yahoo for bulk senders since February 2024. The Marketo docs had pages for SPF and DKIM but no coverage of DMARC at all. This adds a comprehensive DMARC guide covering: - How DMARC works with SPF/DKIM alignment - DNS record structure and tag reference - Policy options (none → quarantine → reject) - Step-by-step rollout sequence to avoid blocking legitimate mail - Marketo-specific alignment considerations (custom DKIM vs shared) - Subdomain inheritance gotcha (sp= policy trap) - Verification and troubleshooting steps Also adds TOC entry and cross-link from the existing SPF/DKIM page. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Adds a new documentation page for DMARC (Domain-based Message Authentication, Reporting and Conformance) to the Email Marketing > Deliverability section.
Why this matters: The existing docs cover SPF and DKIM but have zero coverage of DMARC — the third leg of email authentication. Since February 2024, Gmail and Yahoo require DMARC records for bulk senders (5,000+ messages/day). Any Marketo user following the current docs to set up email authentication will miss this requirement.
What's included:
none→quarantine→reject) with explanationssp=gotcha that catches enterprises sending from subdomains while the parent domain has strict DMARCFiles changed:
set-up-dmarc-for-your-email.md— new page (189 lines)TOC.md— added entry under Deliverabilityset-up-spf-and-dkim-for-your-email-deliverability.md— added DMARC cross-link to MORELIKETHISTest plan
set-up-spf-and-dkim,set-up-a-custom-dkim-signature,shared-and-dedicated-ip-addresses)[!IMPORTANT],[!CAUTION],[!NOTE],[!TIP]) render with correct styling