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Email Blacklist Checker
Enter a domain or IP address and check against 100+ email blacklists including Spamhaus, SORBS, Barracuda, and SpamCop. See which lists you're on with delisting instructions for each.
Note: This is a demo version with simulated results. Real DNSBL lookups across 100+ blacklists will be available soon.
coldBirds' 6-hour health monitoring catches blacklisting within hours — and our 1:1:1:3 isolation means one blacklisted mailbox affects only 3 mailboxes, not your entire fleet.
See How Isolation Protects You →You Might Also Need
Domain Health
Get an instant health score for any email domain — SPF, DKIM, DMARC, MX records, and blacklist status.
Reputation Lookup
Check your domain and IP reputation across Google Postmaster, Microsoft SNDS, SenderScore, and more.
Header Analyzer
Decode email headers into a human-readable analysis — authentication, routing, delays, and spam indicators.