Free tool

Free email blacklist check. Are your domains listed?

Paste your domains, one per line, and check their domain health and sender reputation against the major DNS blocklists in a minute or two. Ten free, up to a hundred with your work email. It's the same check we run on client infrastructure.

Your sending domainsOne per line (paste straight from a spreadsheet). 10 free. Add a work email for up to 100.

0 domains detectedFree check

Checks your domains against major DNS blocklists plus reputation signals. The same check we run on every client's sending infrastructure.

Why this matters

A blacklisted sending domain quietly kills reply rates. Everything looks fine in your sent folder while prospects never see the message. Paste your domains (sending domains especially) and see where you stand in a minute or two.

Why it matters

What happens when a sending domain gets listed?

Nothing visible. That is the problem. Your emails send fine, your tools report "delivered," and your prospects never see a thing, because providers route listed senders straight to spam. The first symptom is usually just replies drying up.

This checker runs your domains against the major DNS blocklists, the same check we run on every client's sending infrastructure before and during campaigns. Paste up to 10 free; a work email raises it to 100 for agencies and teams with real inventories.

If something is listed: the fix is rarely just a delisting request. It is the practices that caused it: dedicated domains, warmup, managed volume, verified lists. That cleanup is literally our job. And before your next campaign, run the copy through the spam checker too.

FAQ

Blacklist questions.

What is an email blacklist?

A public list of domains and IPs that mail providers treat as spam sources. If your sending domain lands on one, your emails start disappearing into spam folders, quietly. Your sent folder looks normal; your replies just stop.

How did my domain get blacklisted?

The usual causes: sending too much too fast from a fresh domain, emailing bought or unverified lists (bounces are the #1 signal), missing authentication (SPF/DKIM/DMARC), or spam complaints. Sometimes a shared server neighbor drags you on with them.

How do I get off a blacklist?

Each list has its own delisting process: some clear automatically once the behavior stops, some take a request form. But delisting without fixing the cause means you will be back on within weeks. Fix the sending practices first, then delist.

How often should I check my domains?

Monthly for anyone sending cold email, and immediately whenever reply rates drop for no visible reason. A listing caught on day one costs a delisting request; caught in month three, it costs a quarter of pipeline.

Why do you ask for an email above 10 domains?

The check costs us real API credits, so bulk runs are for people we might actually help. You get the results either way and we do not add you to any sequence. One human may follow up once if your results look rough.