DMARC compliance means that an email system follows the DMARC (Domain-based Message Authentication, Reporting, and Conformance) standard, ensuring that outgoing emails are properly authenticated using SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail).
This helps prevent email spoofing, phishing, and unauthorized use of a domain for sending emails.
DMARC Compliance Requirements
For an email to be DMARC compliant, it must meet the following criteria:
1. SPF Alignment:
• The sending mail server must be listed in the domain’s SPF record.
• The domain in the “From” address must match (or be a subdomain of) the domain in the SPF record.
2. DKIM Alignment:
• The email must be signed using a valid DKIM signature.
• The domain in the DKIM signature (d= tag) must match the domain in the “From” address.
3. DMARC Policy Application:
• The domain must have a DMARC DNS record that specifies how to handle emails failing SPF/DKIM checks.
• Common DMARC policies:
• p=none (monitor only)
• p=quarantine (send suspicious emails to spam)
• p=reject (block unauthorized emails)
Why is DMARC Compliance Important?
• Prevents Email Spoofing & Phishing: Stops cybercriminals from sending fake emails using your domain.
• Improves Email Deliverability: Ensures legitimate emails reach inboxes instead of spam folders.
• Provides Visibility & Reporting: Generates reports on email authentication failures to help monitor and improve security.
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