How is DMARC compliance ratio calculated?

DMARC compliance ratio is calculated by the number of emails that passed DMARC Authentication divided by the total number of messages sent from a domain.

There are two ways to pass DMARC validation: by SPF and/or by DKIM.

An email is considered DMARC compliant when it passes either SPF evaluation or DKIM evaluation.

To pass DMARC by SPF evaluation, you need to have a valid SPF record in DNS and use a custom SPF domain (Return-Path domain or “Mail FROM” domain), because SPF evaluation requires the domain in the “From” address to match the SPF domain. 

To pass DMARC by DKIM evaluation, you need to have a valid DKIM record in DNS and sign emails with DKIM on behlaf of your domain (your domain in the d= tag in the signature). 

Learn more about DMARC:

The Ultimate Guide to DMARC Reporting in 2022