Proofpoint Essentials setup
Proofpoint Essentials: legitimate mail is quarantined as Fraud after DMARC fail
Proofpoint can quarantine a message as Fraud when DMARC fails under a quarantine or reject policy.
The visible symptom is:
Proofpoint Essentials quarantined the message as Fraud after DMARC authentication failed.
Fix the DMARC failure
- Open the message details and copy the From domain, Return-Path, DKIM d= domain, and Authentication-Results.
- Repair one complete DMARC path: SPF pass plus alignment, or DKIM pass plus alignment.
- For forwarded mail, check whether forwarding changed the envelope sender or message content.
- Send a new message and confirm dmarc=pass.
- If a trusted forwarding service cannot preserve authentication, an administrator can add a narrow Proofpoint anti-spoofing exception for its domain.
Avoid a broad bypass
Proofpoint recommends fixing the sender’s authentication as the long-term solution. An exception weakens protection and should cover only the trusted domain and failed check that require it.
What the check proves
MailFixIt can show public authentication configuration. Proofpoint message details are needed to show why the specific message was classified as Fraud.
Frequently asked questions
Why did a safe sender entry not prevent Fraud quarantine?
Proofpoint evaluates anti-spoofing separately. A sender can be trusted by users and still fail DMARC authentication.
Does a correct DNS record prove the provider is using it?
No. The provider must also activate the matching route or signing policy. Confirm the result in its console and in a new message.
Related email diagnostics
Primary sources: Proofpoint Essentials: how DMARC works.