What this tool checks
- Resolved IPv4 address
- DNSBL listings found
- Clear or listed status
Email Deliverability Tools
Email Blacklist Checker
Check a public mail IP against common DNSBL zones.
Run the check
Enter a public target. Checks are a point-in-time sample; private and internal addresses are blocked.
Why it matters
Blacklist listings can affect whether emails reach inboxes.
Plain-English examples
- Check the outbound SMTP server IP
Recommended fixes
- Investigate compromised mailboxes
- Request delisting only after fixing the root cause
Understanding the result
Use findings as a starting point, confirm the intended configuration with your provider, and retest after a change. A successful check does not guarantee security, delivery, uptime or search rankings. Results depend on public DNS and what the server exposes at the time of the check.
Related tools
Run these checks next for a fuller picture.
MX Checker
Find mail exchanger records and priorities for a domain.
Run checkSPF Checker
Find and analyse SPF records for sender authorisation.
Run checkDKIM Checker
Check a DKIM selector under selector._domainkey.domain.
Run checkDMARC Checker
Check DMARC policy, reporting tags and enforcement readiness for your domain email.
Run checkNeed help fixing the result?
