DMARC XML Report Analyzer
Upload and parse DMARC aggregate XML reports locally. Diagnose SPF/DKIM alignment failures and identify unauthorized senders instantly.
Select or Drag your DMARC XML File
Choose a raw .xml DMARC aggregate report. (Please extract .xml.gz or .zip files before uploading).
- What is Client-Side Dmarc Analyzer � Free Online Tool?
- Client-side execution is a zero-knowledge processing model where operations run directly inside your web browser via WebAssembly and JavaScript engines. No files or personal data are ever uploaded to cloud servers, providing 100% data security and 0ms upload latency.
- Why use offline browser processing instead of cloud upload services?
- Offline local processing eliminates file size upload limits, waiting queues, and third-party data collection risks. It is compliant with strict enterprise data security standards including HIPAA, GDPR, and PCI-DSS.
Zero-Knowledge Execution Environment
Unlike cloud-based platforms that upload files to third-party servers, NexaTools operates 100% inside your browser memory via WebAssembly and modern browser APIs. Your data never leaves your device, eliminating data leak risks and guaranteeing absolute confidentiality.
Technical Processing Specifications
| Component | NexaTools (Client-Side) | Legacy Cloud Services |
|---|---|---|
| Processing Boundary | 100% In-Browser (Client-Side) | Remote Cloud Server |
| Data Transmission Risk | Zero (0 bytes transmitted) | High (HTTP POST over WAN) |
| Latency | Instant (no upload wait) | Dependent on upload speed |
| Software Installation | None (browser only) | App or plugin required |
DMARC, SPF, and DKIM Email Authentication Trilogy
Domain-based Message Authentication, Reporting, and Conformance (DMARC), standardized under RFC 7489, provides the authoritative security framework protecting corporate domains against spoofing, phishing, and CEO fraud. DMARC does not operate in isolation; rather, it builds upon two foundational email authentication protocols: Sender Policy Framework (SPF, RFC 7208) and DomainKeys Identified Mail (DKIM, RFC 6376).
NexaTools DMARC Analyzer performs lexical analysis and RFC syntax validation across all standard DMARC policy tags directly within your browser. The engine parses published DNS TXT records, identifies syntax errors, and validates domain alignment modes:
Policy Enforcement Tag (p=)
Evaluates domain enforcement level: p=none (monitoring only, no delivery impact), p=quarantine (routes failing messages to spam folders), or p=reject (instructs receiving MTAs to drop unauthorized emails immediately).
Alignment Modes (aspf & adkim)
Audits alignment strictness: Relaxed (r) permits subdomains to match the organizational domain, while Strict (s) mandates exact domain matching between the RFC 5322 From header and authentication identities.
Aggregate & Forensic Feedback (rua & ruf)
Parses reporting URIs configured to receive XML diagnostic summaries (RUA) and real-time forensic failure notifications (RUF) from global receiving mail servers like Google, Microsoft, and Yahoo.
Percentage Tag (pct=)
Verifies gradual rollout percentage (1-100). Essential during policy transition phases to quarantine or reject small message fractions before enforcing full 100% domain lock down.
Meeting 2024 Google and Yahoo Mail Deliverability Requirements
In 2024, major mailbox providers Google and Yahoo introduced mandatory email authentication requirements for bulk senders dispatching over 5,000 messages daily. Senders without valid SPF, DKIM, and DMARC records face automated rejection and delivery rate throttling.
NexaTools DMARC Analyzer helps email administrators and marketing operations teams test, debug, and optimize their DNS records prior to production deployment. Because all record parsing is executed locally in your browser sandbox, confidential DNS configurations and internal security architectures remain completely private.
Authenticated Received Chain (ARC) & Mailing List Forwarding
One of the most complex challenges in enterprise email authentication is legitimate message forwarding. When an authorized message passes through an intermediary service�such as an automated mailing list, alumni email forwarder, or cloud CRM filter�the intermediary often alters the email body (adding unsubscribe links or footers) and changes the sending IP address.
These modifications inevitably break SPF (because the forwarder IP is not listed in the sender's SPF record) and invalidate DKIM (because body modifications corrupt the cryptographic signature hash). Consequently, strict DMARC policies (p=reject) can inadvertently cause legitimate forwarded emails to bounce.
To address this dilemma, the IETF developed Authenticated Received Chain (ARC, RFC 8617). ARC preserves email authentication assessments across intermediaries by attaching cryptographically signed authentication headers (ARC-Authentication-Results, ARC-Message-Signature, ARC-Seal) at each hop. NexaTools DMARC Analyzer helps email administrators evaluate forwarding risks and configure optimal DMARC reporting tags (rua/ruf) to identify forwarding failures before enforcing strict domain rejection.
Free DMARC XML Report Analyzer � How It Works
Upload and analyze DMARC aggregate XML reports locally in your browser. Parse sender IPs, verify SPF/DKIM alignment, and diagnose spoofing issues with 100% privacy. All processing runs locally in your browser � no uploads, no account required, no size limits imposed by NexaTools.
How to Use Dmarc Analyzer
Open the tool in your browser, provide the required input, and the result is generated instantly on your device. No internet connection is required once the page has loaded.
Privacy and Security
No data is ever transmitted to NexaTools servers. The tool runs entirely within your browser's sandboxed environment, making it safe for confidential, financial, and legal content.
Browser Compatibility
Fully supported in Chrome, Firefox, Edge, and Safari. No plugins required. Works on desktop and mobile.