Learning centre

Practical DMARC guidance from records to enforcement.

Start with the concepts you need now. Each guide links to the relevant current specification and related diagnostic tools.

Start here

What DMARC is and what it does not do.
How to build and publish a DMARC record.
How aggregate reports are structured.
How SPF and DKIM alignment determines DMARC results.

Operate safely

Authorise an external report receiver.
Investigate why reports have not arrived.
Move from monitoring to quarantine or reject using evidence.

Private testing

Connect a domain when you are ready.

Invitation-only access is free during testing. It will not remain a permanent free service.

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