Receiver rejection names the list; operator lookup confirms the exact asset and active category.
All toolsSee the response,
REPUTATION EVIDENCE / DNSBL RETURNS / RESOLVER CALIBRATION
See the response,
not a fake clean badge.
Query selected IP and domain blocklists, preserve the exact DNS evidence, and distinguish “no listing response observed” from a check the public resolver was not allowed to perform.
IPv4 + IPv6 + domains Exact query names JSON evidence
NO REPORT YET
Start with the actual sending asset.
Check outbound sending IPs—not website hosts or inbound MX servers unless those are truly the assets in the rejection. For a domain listing, use the domain named by the provider or SMTP evidence.
SMTP EVIDENCEEXACT ASSETLIST OPERATOR
01 / EVIDENCE
A blocklist response is one signal in one receiver’s decision.
DNSBLs publish queryable data through DNS. An IP lookup reverses address components before the list zone; a domain lookup prepends the domain. A returned loopback address can represent a listing category—or a query error. NXDOMAIN ordinarily means no record was returned, but resolver access policy can make that absence inconclusive.
ASSET
203.0.113.79REVERSE
79.113.0.203ZONE
79.113.0.203.list.example02 / OBJECT TYPE
Website IP, inbound MX, and outbound sender are not synonyms.
IP DNSBLs normally evaluate connection-source IPs. Domain lists can evaluate domains observed in message bodies, redirects, authentication, or other contexts defined by the operator. A domain’s A record or MX address is not automatically its sending IP. Start from delivered headers, ESP logs, or the receiver’s enhanced SMTP rejection.
03 / CALIBRATION
Public DNS can make a bad checker look reassuring.
Spamhaus documents special error returns for public resolvers, excessive queries, and mistyped zones. It also says public resolvers can return NXDOMAIN for queries that were not permitted. This tool tests a known-positive and known-negative ZEN query before interpreting absent Spamhaus answers, and never converts a restricted path into “clean.”
04 / PRIORITY
Impact is proven by receiver evidence, not list count.
A listing matters most when a receiver’s SMTP response names it or when the operator’s category explains current behavior. SpamCop describes its SCBL as aggressive and encourages tagging or diversion rather than automatic blocking. A Spamhaus PBL policy return can describe address space that should not send mail directly without alleging that the IP itself emitted spam.
A listing is observed, but no affected receiver references it and the category may be policy-based.
No public listing is observed, but receiver reputation, complaints, authentication, or content still fail.
05 / REMEDIATION
Removal begins with fixing the cause.
Confirm the listing through the operator, read its category and evidence, identify who controls the asset, contain the behavior, and follow the official instructions. Spamhaus directs users to its IP and Domain Reputation Checker and says some network listings require the responsible provider to act. Removal is not a substitute for restoring consent, security, authentication, or receiver reputation.
COMMON QUESTIONS
Email blacklist checker FAQ.
Does zero observed listings mean my sender reputation is good?+
No. It only means this scan did not observe a positive return from the selected checks. Receivers maintain private reputation systems and use authentication, complaints, behavior, content, and many other signals.
Why is Spamhaus marked resolver-limited?+
Spamhaus restricts public/open resolver access. It documents error codes and cases where a public resolver returns NXDOMAIN rather than usable reputation data. Verify with its official checker or an authorized query service.
Should I scan my website IP?+
Only if evidence identifies it as relevant. Hosted websites, inbound MX servers, and outbound email often use different infrastructure. Use the connection-source IP from headers or sending logs.
Does a PBL result mean the IP sent spam?+
Not necessarily. Spamhaus PBL is policy-oriented address-space data. Read the exact category and operator explanation before responding.
Can I pay someone to remove every listing?+
Use only the official list operator’s process. Fix the cause first. Unrelated paid removal offers do not control third-party datasets and can expose you to scams.
PRIMARY MATERIAL
REPUTATION NEEDS CONTEXT
Operate every sending identity with its evidence attached.
Manage authenticated domains, transactional streams, audiences, campaigns, and delivery outcomes together.
Start for free