Project: Demarkable - DMARC and SMTP-TLS Viewer for MacOS

Every domain sending email gets DMARC aggregate reports and SMTP TLS reports back from Google, Microsoft, Yahoo, and every other major mailbox provider — dense XML and JSON files nobody actually enjoys reading. Demarkable turns them into something you can actually understand at a glance.

Drag a report in any of xml, zipped, or gzipped files, it doesn’t matter and Demarkable shows you exactly what happened: which servers sent mail as your domain, whether SPF and DKIM passed and aligned, and in plain English, why a message failed if it did. SMTP TLS reports: which connections were encrypted under MTA-STS or DANE, which failed, and what actually went wrong (expired certificate, no STARTTLS support, a broken policy all spelled out for you.

Highlights

• Drag-and-drop (or ⌘O) import of DMARC aggregate reports and SMTP TLS reports
• Accepts .xml, .json, .zip, and .gz — auto-detects which report type it’s looking at
• Per-source breakdown: sending IP, message volume, disposition, SPF/DKIM pass or fail
• Plain-English explanations for every failure — no more decoding raw result codes
• TLS report failure types explained: expired certs, missing STARTTLS, MTA-STS/DANE policy problems
• Local history of every report you’ve imported, with pass-rate at a glance — clear it anytime
• Native SwiftUI app built for the Mac — fast, no browser, no account, no subscription

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