The interactive guide to B2B outreach›The vocabulary of outreach›DMARC

What is DMARC?

DMARC tells mailbox providers what to do when an email claims to come from your domain but fails the SPF and DKIM checks: let it through, quarantine it, or reject it. Since 2024, Google and Yahoo require it for any sending at volume.

In the guide

For the practical side, the how-to page goes further than the definition.

SPF, DKIM and DMARCThree records to add in your domain's DNS zone, at the host that manages it. They prove to mail→