DmarcLock resources

Practical guides for safer email authentication

Clear, implementation-focused guidance for teams responsible for domain security, deliverability, and DMARC enforcement.

DMARC Enforcement

How to safely move from DMARC p=none to p=reject

A phased playbook for discovering legitimate senders, correcting alignment, and preventing email delivery blackouts.

SPF Troubleshooting

Understand recursive DNS queries, common SPF PermError causes, and automated ways to flatten and monitor large sender stacks.

DMARC Telemetry

Parse RFC 7489 XML feedback, identify shadow IT senders, and turn raw aggregate telemetry into confident policy enforcement.

Want to check a domain before changing DNS? Run the free DMARC scanner, then use the results to plan remediation.

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