How to Check If Your Domain Is Blacklisted (Free Guide)

Email blacklists are databases of domains and IP addresses flagged for sending spam or malicious email. Major email providers (Gmail, Outlook, Yahoo) check these lists when deciding where to deliver your email.

If your domain or IP appears on a blacklist, your inbox placement can drop from 80%+ to near 0% overnight.

Not all blacklists carry equal weight. Here is every major blacklist ranked by impact on cold email deliverability:

Check all of them. Being listed on Spamhaus alone can drop your inbox rate from 85% to under 10% overnight.

Use multiple tools for complete coverage. each checks different blacklists.

Manual checking is reactive. By the time you run a manual check, your domain may have been blacklisted for days. InfraGuard monitors continuously and alerts within hours of any listing, before significant damage occurs.

Removal is a three-step process: identify the cause, fix it, then request delisting. Skipping step two guarantees re-listing.

InfraGuard auto-pauses affected mailboxes the moment a blacklist is detected, preventing further damage while you resolve the issue.

Prevention is dramatically cheaper than recovery. A blacklisted domain takes 1-3 weeks to fully recover.

The single highest-ROI action is continuous monitoring. Most blacklistings go undetected for 3-7 days without automated monitoring, during which thousands of emails are wasted.