optinize Book a call
Home / Free Tools / Free blacklist check
Free blacklist check

Check whether reputation damage may be blocking your mail.

Use this page to start a reputation check. A blacklist result is only one signal; provider filtering can happen without a public listing.

FreeNo cardBuilt for diagnosis
Enter a domain or IP.

Do not publish DNS records or suppress customer data solely from an automated result. Validate changes against your actual sending stack.

What this tool can and cannot tell you

Useful for

  • Fast initial diagnosis
  • Finding obvious configuration or content risk
  • Preparing a more focused technical review

Not proof of inbox placement

  • Mailbox providers use private reputation signals
  • Results vary by message, audience and infrastructure
  • A real placement test requires a controlled send

Need the answer mailbox providers do not publish?

Run the full inbox placement test across Gmail, Outlook and Yahoo, then receive fixes ranked by impact.

Open the placement testTalk to an expert