DMARC Lighthouse

DMARC aggregate reports (RUA) and failure reports (RUF) often land in a dedicated mailbox and are hard to read. DMARC Lighthouse fetches these emails via IMAP (or via file import), parses them locally, and shows at a glance:

how many messages passed or failed, and which dispositions (none / quarantine / reject) were applied whether DMARC, SPF, and DKIM alignment hold which sources (IPs), From domains, and reporting organizations stand out how volume and pass rate evolve over time optional alerts for rising failures, a low pass rate, or newly seen source IPs forensic / RUF failure reports as a sanitized table (headers only — no message bodies)

Everything runs locally on your machine: credentials and OAuth tokens stay in the Electron userData folder, encrypted with safeStorage. Report caches use SQLite. There is no cloud account and no telemetry. The UI is available in German and English.