Security Considerations for Sharing DMARC Reports with Third Parties
Question details
Understand the security, privacy, and compliance implications of routing DMARC aggregate reports to external third-party reporting services.
- Product
- Email Security
- Device & OS
- not provided
- Scenario
- Configuring DMARC rua records to send aggregate domain reports to a third-party vendor for analysis.
- Observed behavior
- DMARC reports expose internal domain sending patterns, IP addresses, and authentication results, raising potential vendor risk and data privacy concerns when shared externally.
Before configuring your DMARC records, identify all internal systems and authorized external services that currently send emails on behalf of your domain to accurately assess your compliance requirements.
Evaluate and Secure Third-Party DMARC Providers
Thoroughly vet any external DMARC reporting service before routing your aggregate reports to them to minimize vendor risk.
Sharing DMARC reports with external vendors introduces potential risks because the aggregate data maps out your internal sending infrastructure. Choosing a compliant and reputable provider ensures your data remains protected.
Review the DMARC reporting provider's security, privacy, data retention, and compliance (e.g., GDPR, SOC2) policies before signing up.
Access your domain's DNS manager and add the trusted provider's designated reporting email address to your domain's DMARC 'rua' tag (e.g., rua=mailto:reports@trustedprovider.com).
Within the provider's platform, enforce Role-Based Access Control (RBAC) and mandate Multi-Factor Authentication (MFA) for all users accessing the report data.
Analyze DMARC Reports Locally
If sharing data externally violates strict compliance rules, route aggregate reports internally and parse them on local machines.
Analyze DMARC XML Reports Securely with WPS Spreadsheet
Avoid third-party data sharing risks by importing and analyzing DMARC aggregate XML reports locally using WPS Office. Keep your domain's IP and email volume data entirely in-house.
- 1. Launch WPS Spreadsheet: Open WPS Spreadsheet on your secure local workstation where you have downloaded the DMARC reports.
- 2. Import the XML or CSV Data: Navigate to the 'Data' tab, select 'Import Data', and browse to your extracted DMARC XML or CSV file to load it into the sheet.
- 3. Analyze with PivotTables: Highlight the imported data and create a PivotTable to quickly aggregate sending IP addresses and track SPF or DKIM authentication failures.
Frequently Asked Questions
What sensitive information is contained in a DMARC aggregate report?
DMARC aggregate reports (RUA) contain the sending IP addresses, message volumes, domain names, and the pass/fail status of SPF and DKIM authentication checks. They do not contain the actual email subject or body content.
Do DMARC forensic reports pose a higher security risk than aggregate reports?
Yes. Forensic reports (RUF) can contain parts of the actual email message that failed authentication, including headers, subject lines, and body snippets, making them a significantly higher privacy and compliance risk.
How do I stop sending DMARC reports to a third party?
To stop external sharing, access your domain's DNS settings and edit the DMARC TXT record. Remove the third-party email address from the 'rua=' or 'ruf=' tags and replace it with an internal address, or remove the tag entirely if you no longer wish to receive reports.
Can I send DMARC reports to multiple providers simultaneously?
Yes, you can specify multiple email addresses in the 'rua' tag by separating them with commas (e.g., rua=mailto:internal@domain.com,mailto:reports@vendor.com). However, sharing with multiple vendors multiplies your overall data privacy risk.
