DMARC Setup and Email Authentication
Stop email spoofing before it costs you a client
If someone can send an email that looks like it came from your domain, your clients and vendors have no way to know it is fake. SPF, DKIM, and DMARC are the three records that stop it.
Mechanics
What DMARC actually does
DMARC tells receiving mail servers what to do when someone sends email pretending to be from your domain. SPF defines which servers may send on your behalf. DKIM adds a cryptographic signature proving the message was not tampered with.
All three at enforcement level means spoofed email is rejected before it reaches anyone. We take organizations from no email authentication to DMARC at p=reject with full SPF and DKIM alignment. That is the only posture that actually protects your domain.
Engagement
What the engagement looks like
We start by reviewing your current DNS records and identifying everything that needs to change. We implement SPF cleanup, DKIM signing, and DMARC in reporting mode so you can see what is sending mail on your behalf before enforcement goes live.
Once the traffic is clean we move to quarantine, then to reject, monitoring aggregate reports at each stage so legitimate mail is never collateral damage. MTA-STS and TLS-RPT are available as a follow-on for organizations that want transport security enforced as well.
Where to next
- Not sure you need this yet? The free domain check reads your public DNS in about ten seconds and tells you what the rest of the internet can already see.
- Most of this work is covered by Security Essentials, at $395 onboarding then $199 a month for teams up to 20.
- Want the whole picture first? The assessment covers identity, email, endpoints and backups, and everything else starts from what it finds.
Better security starts with knowing what is missing.
Start with a focused assessment. Fix the highest-priority gaps. Add the right layers over time.