Uh-oh! Your DMARC Policy is Live, But It’s Not Working Like You Expected...
You’ve set up DMARC (Domain-based Message Authentication, Reporting, and Conformance) for your domain, and you’re feeling pretty good about your email security. However, after a few weeks, you realize your DMARC policy is not being enforced.
This means emails from your domain are not fully protected against phishing and spoofing attacks, and you're not getting the level of security you were hoping for. Don't panic though! We’ve got your back.
Let's walk through what to do next to move from "monitor" to "enforce" mode and ensure your domain stays protected.
Step 1: Understand the Different DMARC Policy Levels
Before diving into solutions, it's important to know exactly where your policy stands. DMARC has three settings:
- None: This is the "monitoring" policy. It allows you to collect reports without taking action on failing messages. Great for testing.
- Quarantine: This policy moves failing emails to the spam folder (a good middle-ground).
- Reject: The gold standard! This policy actively blocks any emails that don’t pass DMARC validation.
If your policy is still set to “None,” it's time to take the next step!
Step 2: Review Your DMARC Reports for Clarity
DMARC gives you reports that show how your emails are performing under the policy. If you're still in “None” mode, these reports will let you know what’s working and what isn’t. Here's what to focus on:
- Aggregate Reports: These show the overall performance of your domain. Look for the failures to see which emails are failing SPF or DKIM checks.
- Forensic Reports: These are more detailed, showing specific instances where emails failed authentication.
If your reports show failures, don’t be alarmed—they’re simply a sign that there’s work to do. The next step is to address those issues.
Step 3: Align SPF and DKIM with Your DMARC Policy
If your DMARC policy isn't being enforced, chances are there's a misalignment between your SPF (Sender Policy Framework) or DKIM (DomainKeys Identified Mail) settings and DMARC.
Here’s how to check and fix that:
- SPF: Ensure that all legitimate mail servers that send emails on behalf of your domain are listed in your SPF record. Use tools like MXToolbox to check your SPF.
- DKIM: Make sure your email servers are signing outgoing emails with DKIM. If you don’t have DKIM set up, configure it on your mail server and publish the DKIM public key in your DNS.
Tip: Ensure that both SPF and DKIM are aligned with your domain. DMARC requires this for successful validation.
Step 4: Change DMARC to “Quarantine” or “Reject”
Once you’re confident that SPF and DKIM are correctly set up and aligned, it’s time to take action! Move your policy from “None” to “Quarantine” or “Reject.”
Here’s a quick refresher on the process:
- Quarantine: This option places suspicious emails in the spam/junk folder. It’s a soft way of enforcing DMARC while still allowing some leeway.
- Reject: This is the ultimate defense. Any email failing DMARC checks will be rejected outright. Use this when you're ready to fully protect your domain.
Update your DMARC policy in your DNS to reflect the new setting:
txtCopyEditv=DMARC1; p=reject; rua=mailto:dmarc-reports@yourdomain.com; ruf=mailto:dmarc-forensics@yourdomain.com; sp=reject; adkim=s; aspf=s;
Step 5: Monitor and Adjust As Needed
Even after setting your policy to “reject,” it’s essential to keep monitoring your reports regularly. The landscape of email authentication is ever-changing, and you’ll want to catch any new issues before they become serious problems.
- If your legitimate emails are being mistakenly rejected, adjust your SPF/DKIM records or move the policy back to “Quarantine.”
- If everything is running smoothly, you’re all set!
Step 6: Educate Your Team About DMARC
It’s not just about the tech—it's about the people using your domain too. Make sure everyone on your team knows the importance of email security and how DMARC helps prevent phishing attacks. This could involve:
- Regular training on spotting phishing emails.
- Setting up automatic signatures and authentication for all outgoing emails.
- Creating internal processes for domain management.
Watch: https://www.youtube.com/embed/BcD9UCILulU?rel=0
Final Thoughts: Be Proactive, Not Reactive
Once your DMARC policy is enforced and aligned with SPF and DKIM, your domain is well on its way to becoming email-security bulletproof. The key takeaway here is proactive monitoring and quick action.
By taking the right steps and gradually strengthening your DMARC policy, you’ll build up a solid defense against email fraud, spoofing, and phishing attacks.
So, why wait? Let’s make sure your domain is fully protected—from monitor to enforce!
Remember, email security isn’t a one-time job. It’s a continuous process, and with DMARC, you’re already one step ahead of the game. 🚀
