DMARC (Domain-based Message Authentication, Reporting & Conformance) ties SPF and DKIM together under a single policy, telling receiving mail servers exactly what to do with messages that fail authentication, and giving you visibility into every attempt.
SPF and DKIM each check different things, but neither one, by itself, tells a receiving mail server what to actually do when a message fails. DMARC closes that gap. It's a DNS TXT record that defines a policy: monitor only, quarantine (send to spam), or reject outright, along with where reports on that activity should be sent.
DMARC also requires alignment, meaning the domain in the visible "From" address has to match up with what SPF and DKIM actually authenticated. That alignment check is what makes DMARC effective at stopping exact-domain spoofing that SPF or DKIM alone can miss.
We publish a DMARC record at policy "none," so nothing is blocked yet, but you start receiving reports on every message claiming to be from your domain.
We analyze those reports to identify every legitimate sender, catch anything misconfigured, and flag genuine spoofing attempts.
Once legitimate senders are confirmed and passing, we step the policy up so failing mail is routed to spam instead of the inbox.
With confidence built up, we move to a reject policy, the strongest setting, so spoofed mail is blocked before it ever reaches an inbox.
Publishing SPF and DKIM without DMARC means receiving servers have no consistent instructions on what to do with mail that fails those checks; many will let it through anyway. DMARC is what actually gives you enforcement and, just as importantly, visibility into who is sending mail as your domain in the first place.
Our team will publish your DMARC record, monitor the reports, and step your policy up from monitoring to full enforcement, safely and without disrupting your legitimate mail flow.
MDA Insights helps businesses lock down their email domains against spoofing, phishing, and impersonation with SPF, DKIM, and DMARC configured right the first time, and monitored so they stay that way.
2026 MDA Insights - All Rights Reserved.