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Free private delivery tool

Understand what each delivery report says.

Turn a delivery failure notification or DSN into structured SMTP evidence. MailDNS separates the reported action from the status family and never treats supplied text as proof of a remote event.

  • Local by design

    The complete bounce stays in this browser tab and is never uploaded.

  • Per-recipient evidence

    Read Final-Recipient, Action, Status, Remote-MTA, and Diagnostic-Code together.

  • Honest interpretation

    Standard status families are explained without inventing provider-specific intent.

Open a bounce notification

Paste the complete delivery failure or choose an .eml/.txt file. Parsing runs in this tab; MailDNS does not upload, store, resolve, or contact anything in the message.

Maximum 5 MB. Addresses and diagnostic text remain on this device.