Some organizations configure their DMARC (Domain-based Message Authentication, Reporting and Conformance) record to quarantine or reject emails that fail DMARC checks. Most organizations choose to enforce this rejection for incoming emails with Microsoft/Google.

If you wish to enforce it with Harmony Email & Collaboration, you may configure to trigger the Suspected Phishing or Phishing workflow for emails that fail DMARC checks.

By default, No extra action is selected for DMARC failed emails in the Anti-Phishing security engine.