Sender reputation snapshot

Is your sending domain or IP on a blocklist?

Enter a sending domain such as example.com or a mail-originating IPv4 such as 192.0.2.1. We'll run the configured DNS and reputation checks and return provider-by-provider results, a risk score, and next steps for listed, clean, partial, or unavailable outcomes — no signup required.

Start with a sender target

Check a domain or IPv4 address
Enter the domain or IP your mail originates from. We'll pass it into the blacklist checker and prepare the detailed status report.

Use the domain or public IPv4 address associated with your outbound mail.

Ready for a lookup

Enter a domain or IPv4 address to begin
We'll show the configured provider checks and explain what to do with the result.

Simple, point-in-time check

How the free blacklist check works

No signup required. Check a sending identity, understand what each provider returned, and take the next practical step.

  1. Enter a target

    Enter the sending domain or IPv4 address you want to check.

  2. Review each result

    Review provider-by-provider clean, listed, or unavailable results from this point-in-time check.

  3. Follow the guidance

    Fix the cause or follow the listed provider's delisting instructions, then rerun the free check.

FAQ

Blacklist lookup — frequently asked questions

Continue your deliverability check

Check the rest of your sending setup

A clean blocklist result is one signal. Review SPF, DKIM, and DMARC, or run the full audit for a broader view of your sender reputation and inbox readiness.

SPF record checker DKIM validator DMARC checker Run the full deliverability audit