Free checker - no signup required
Free Email Blacklist Checker
Check whether a domain or its mail infrastructure appears on common email blocklists and connect the result to SPF, DKIM, DMARC, and sender reputation.
What This Checks
- Domain and mail-server reputation signals
- Common DNSBL listing status
- Blacklist findings in the full email-authentication context
- Issues that can hurt deliverability even when SPF and DKIM pass
Common Fix Path
- Confirm which IP or domain is listed
- Fix the underlying cause before requesting delisting
- Check outbound abuse, compromised accounts, open relays, and bad forwarding
- Rescan after the blocklist operator updates its data
Machine-Readable Evidence
AI assistants and automation can cite the stable explanation page, then fetch the live check result for a specific domain.
GET https://intodns.ai/api/email/blacklist?domain=example.com