DMARC
Also called Domain-based Message Authentication, Reporting and Conformance.
DMARC is a setting on your domain that tells inboxes what to do with email that fails SPF or DKIM checks.
You add it as a DNS record. It sets a policy: none (only report), quarantine (send to spam) or reject (block). It can also ask inboxes to send you reports, so you see who sends email in your name. It needs SPF or DKIM in place first.
Gmail requires DMARC for bulk senders. Start with the policy none, read the reports for a few weeks, then move to quarantine. It protects your email deliverability and makes it harder for others to fake your domain. Set it up before you warm up a new domainsoon.
Go deeper
- How to warm up an email domain for cold emailComing soon
What links here
Sources
- Email sender guidelines, Gmail Help, checked 24 September 2026
Last checked 24 September 2026.