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Deliverability

See what the filters see.

Paste a delivered message. We verify its DKIM, read the authentication results the receiving server recorded, and show the structural signals that matter — without pretending a number can predict your inbox.

Updated

Checked once in memory and discarded. Not stored, not logged. Don't paste passwords or recovery codes.

0 / 400,000

What this reads

Evidence, not a verdict.

  • DKIM — verified against the selector's published DNS record.
  • Authentication-Results — the SPF, DKIM and DMARC verdicts the receiving server recorded.
  • Alignment — whether Return-Path and the DKIM signing domain share the From domain's organizational domain.
  • Structure — HTML-only, image-only, link-heavy, scripts, forms, shorteners, attachments.
  • Hygiene — Date, Message-ID, List-Unsubscribe, and subject shape.

What it cannot know

The part that decides the inbox.

  • Reputation — the sending IP and domain history that providers already hold.
  • Engagement — whether people open, reply, delete or mark this sender as spam.
  • Provider weights — Gmail, Outlook and every other filter weigh these differently, and none publish the model.

That is why this page has no score out of 10. Word lists and invented numbers give false precision; the signals above are the ones the message can actually prove.

Authentication gaps are fixable today. Start with the DMARC record generator, the SPF generator & checker, or run the deeper deliverability audit against the domain.