Free Email Blacklist Checker

Email blacklists are databases of IP addresses and domains that have been flagged for sending spam. Mailbox providers like Gmail, Outlook, and Yahoo check these lists when deciding whether to accept your email. If your sending IP or domain appears on a blacklist, your emails may be blocked or routed straight to spam — even if your content and authentication are perfect.

You can end up on a blacklist for sending to spam traps, generating high complaint rates, having a compromised server, or even sharing an IP with another sender who did. Some blacklists delist automatically after a period of good behaviour. Others require a manual removal request.

Our free checker scans your domain and IP against major blacklists in one lookup. See where you're listed, understand what it means for your deliverability, and know which lists to contact for removal.

Teams across industries rely on blacklist monitoring — from SaaS companies and e-commerce businesses to email marketers, agencies, small businesses, and IT administrators. See how we compare to MXToolbox, free tools, manual checking, and spreadsheet tracking.