AI & Automation

DMARC

Definition — DMARC

DMARC (Domain-based Message Authentication, Reporting, and Conformance) is an email authentication protocol that builds on SPF and DKIM to define what happens to emails that fail authentication and provides domain owners with reports on email authentication activity. DMARC with a policy of quarantine or reject is required by Gmail and Yahoo for bulk senders as of 2024.

Quick Answer

What is DMARC?DMARC (Domain-based Message Authentication, Reporting, and Conformance) is an email authentication standard that enables domain owners to: (1) declare a policy specifying what receiving mail servers should do with emails that fail SPF or DKIM authentication (none=no action, quarantine=send to spam, reject=block entirely), and (2) receive aggregate and forensic reports about email

What is DMARC?

DMARC (Domain-based Message Authentication, Reporting, and Conformance) is an email authentication standard that enables domain owners to: (1) declare a policy specifying what receiving mail servers should do with emails that fail SPF or DKIM authentication (none=no action, quarantine=send to spam, reject=block entirely), and (2) receive aggregate and forensic reports about email authentication results, showing who is sending email on behalf of your domain and whether SPF and DKIM are passing or failing. DMARC requires both SPF and DKIM to be correctly configured: it validates that at least one (or both) authentication methods align with the domain in the email From header.

DMARC Policy Levels for SaaS Companies

Three DMARC policy levels: p=none (monitoring mode: no emails are blocked, reports are generated to understand authentication landscape before enforcement), p=quarantine (suspicious emails are delivered to spam folder rather than inbox), p=reject (emails failing DMARC are blocked and never delivered). For SaaS companies: start with p=none for 30-60 days to collect DMARC reports and confirm all legitimate email sending services are properly authenticated. Then move to p=quarantine once confident, and ultimately to p=reject for maximum anti-spoofing protection and best deliverability reputation.

Frequently Asked Questions

Why is DMARC required for Gmail and Yahoo bulk senders in 2024?

In October 2023, Google and Yahoo announced that bulk email senders (5,000+ emails per day to Gmail/Yahoo) must have DMARC with at least p=none policy as of February 2024. This requirement was implemented to reduce email spam, phishing, and spoofing at scale. SaaS companies sending marketing or outreach emails at scale must implement DMARC (along with SPF and DKIM) or risk having emails rejected by Gmail and Yahoo servers. This affects virtually all SaaS companies with active email marketing or outbound sales programs.

How do I read DMARC reports?

DMARC generates two report types: (1) Aggregate reports (RUA): XML files sent daily by participating mail servers showing volume of emails processed, pass/fail rates, and sending sources. (2) Forensic reports (RUF): individual samples of failed emails (not universally supported by mail providers). Parse DMARC aggregate reports using dedicated tools: Postmark DMARC (free), MXToolbox DMARC analyzer, Valimail (enterprise), or DMARC Analyzer. These tools transform the raw XML into readable dashboards showing which servers are sending email on behalf of your domain and their authentication success rates, enabling rapid identification of unauthorized senders or misconfigured sending services.

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