DMARC Report Analyser

A browser-only tool for inspecting DMARC aggregate (rua) XML reports. No backend, no data leaves your machine.

Features

• Upload — drag-and-drop or pick multiple .xml and .zip files at once; ZIPs are decompressed in-browser (no server)
• Summary dashboard — total messages, pass rate with progress bar, date range, unique IPs, reporter count
• Sending infrastructure detection — infers sender from DKIM selectors (Google Workspace, Amazon SES, Resend, Brevo, Postmark, Mailgun, HubSpot, and more)
• Records table — sortable by any column, filterable by result / reporter / free-text search, paginated
• Row colour-coding — green for full pass, yellow for partial, red for any failure or non-none disposition
• Failure detail panel — full auth_results breakdown per failing record including DKIM selector, SPF scope, and applied policy

Getting started

npm install
npm run dev

Open http://localhost:3000.

Stack

Layer	Choice
Framework	Next.js 16 (App Router)
Language	TypeScript
Styling	Tailwind CSS v4
ZIP decompression	Native DecompressionStream API
XML parsing	Native DOMParser
Dependencies	None beyond Next.js

Project structure

src/
├── app/                        # Next.js App Router
├── components/
│   ├── ui/                     # DropZone, StatCard, Badge, Toast
│   └── features/               # Analyser, SummaryDashboard, RecordsTable, FailurePanel
└── lib/
    ├── parse.ts                # XML parser + provider/infra detection
    ├── zip.ts                  # In-browser ZIP reader
    └── types.ts                # Shared TypeScript types

Privacy

All parsing happens in the browser. No XML content, IP addresses, or report data is ever sent to a server.

License

MIT