Reputation Monitor

45+ blacklists, one score, zero surprises.

One listing on the wrong DNSBL can silently halve your deliverability. SenderSignal checks every asset against 45+ blacklist and reputation sources and turns the result into a single 0-100 score your whole team understands.

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monitor · blacklists · example.com
Zone results44/45 clean
The source catalog

Real feeds, counted honestly.

Plenty of tools advertise inflated list counts by counting dead or duplicate zones. Our catalog is 45+ curated, active sources, here is the actual breakdown.

34
IP blocklists (DNSBL), Spamhaus ZEN, Barracuda, SpamCop, SORBS, PSBL, DroneBL…
9
Domain & URI lists, Spamhaus DBL, SURBL, URIBL Black/Red/Grey…
5
Dual-coverage lists checking both IPs and domains
6
Commercial reputation APIs, Google Safe Browsing, Cisco Talos, Validity, IPQualityScore, Abusix, SURBL API
Scoring engine

A score you can put on a dashboard, and defend.

The 0-100 reputation score is deterministic and explainable. Every deduction traces back to a specific listing on a specific zone, weighted by severity and resolver confidence.

  • Starts at 100, only confirmed listings deduct points
  • Weighted deductions, list weight × severity × resolver confidence
  • Signal boosts, a Google Safe Browsing hit costs 30 points; a high IPQualityScore fraud rating costs 20
  • Noise-proof, inconclusive lookups add at most a 5-point uncertainty cap
  • Trend history, score movements over time, with drop/rise alerts at your threshold
score breakdown
Check cadence

Rechecked on a schedule you choose.

Checks fire on add, on schedule and on demand. Scheduled cadence scales with plan.

TriggerWhen it runsNotes
Initial scanImmediately on adding an assetFull catalog sweep, results in minutes
Scheduled recheckYour interval, floored by plan: 30 min → every minuteFastest cadence on Business and Enterprise
Manual re-scanAny time, one click or bulkShort cooldown between runs
Delisting confirmationAutomatic after a listing clearsCloses the loop without babysitting
Goes well with

Blacklist status is one signal of several.

Monitoring protects a reputation. Something has to build it first, and something has to prove it is working.

Feature

Inbox Boost

Add a domain. We provision the sending server and publish your DNS.

Learn more Feature

Inbox placement testing

See whether you land in Primary, Promotions or Spam across providers.

Learn more Feature

Alerts & integrations

Slack, email and signed webhooks, routed by your own rules.

Learn more
Use case

High-volume senders

Watch IP fleets and domains at 15-minute resolution with paid feeds.

See the playbook Use case

E-commerce

Protect revenue-critical campaigns from silent blacklistings.

See the playbook
The full catalog

All 45+ sources, searchable.

Not a curated sample. Search by name or DNS zone to check your specific problem list is covered, and see exactly how heavily each one counts against your score.

Not every listing hurts equally

Each source carries a weight. A hit on Spamhaus ZEN takes more off your 0–100 score than a hit on a minor regional list, because receivers weight them differently too. These are the real deductions we apply.

Critical, 20 to 30High, 12 to 19Medium, 8 to 11Low, under 8

Showing every source

SourceDNS zoneListsForScore impact
Spamhaus ZENzen.spamhaus.orgIPsspam−25Critical
Spamhaus DBLdbl.spamhaus.orgDomainsspam−25Critical
Spamhaus SBLsbl.spamhaus.orgIPsspam−22Critical
Spamhaus XBLxbl.spamhaus.orgIPsmalware−20Critical
Spamhaus PBLpbl.spamhaus.orgIPsbulk−10Medium
Spamhaus CSScss.spamhaus.orgIPsspam−18High
Barracuda BRBLb.barracudacentral.orgIPsspam−20Critical
SpamCop SCBLbl.spamcop.netIPsspam−18High
SORBS combineddnsbl.sorbs.netIPsspam−12High
SORBS Spamspam.dnsbl.sorbs.netIPsspam−10Medium
SURBL Multimulti.surbl.orgDomainsspam−20Critical
URIBL Blackblack.uribl.comDomainsspam−20Critical
URIBL Redred.uribl.comDomainsspam−15High
URIBL Greygrey.uribl.comDomainsspam−10Medium
CBL Abuseatcbl.abuseat.orgIPsmalware−15High
Blocklist.debl.blocklist.deIPsabuse−10Medium
UCEPROTECT Level 1dnsbl-1.uceprotect.netIPsspam−8Medium
UCEPROTECT Level 2dnsbl-2.uceprotect.netIPsspam−6Low
UCEPROTECT Level 3dnsbl-3.uceprotect.netIPsspam−4Low
Backscattererips.backscatterer.orgIPsabuse−6Low
NordSpam DBLdbl.nordspam.comDomainsspam−10Medium
NordSpam IPbl.nordspam.comIPsspam−8Medium
SpamRats Allall.spamrats.comIPsspam−10Medium
SpamRats NoPtrnoptr.spamrats.comIPsspam−8Medium
SpamRats Dynadyna.spamrats.comIPsbulk−6Low
Mailspike Blackbl.mailspike.netIPsspam−12High
Mailspike Zero-Repz.mailspike.netIPsspam−8Medium
PSBLpsbl.surriel.comIPsspam−8Medium
IMP SpamRBLspamrbl.imp.chIPsspam−6Low
Weighted Private BLwpbl.pipex.netIPsspam−6Low
DroneBLdnsbl.dronebl.orgIPsmalware−12High
Interserver RBLrbl.interserver.netIPsspam−6Low
Truncatetruncate.gbudb.netIPsspam−8Medium
0Spambl.0spam.orgIPsspam−6Low
Google Safe Browsinggsb.googleapis.comDomainsmalware−30Critical
Hostkarma White/Blackhostkarma.junkemailfilter.comIPsspam−8Medium
JustSpamdnsbl.justspam.orgIPsspam−6Low
s5h.net DNSBLall.s5h.netIPsspam−6Low
SpamEatingMonkey IPv4bl.spameatingmonkey.netIPsspam−8Medium
SpamEatingMonkey URIBLuribl.spameatingmonkey.netDomainsspam−8Medium
Spamhaus DQS AuthBLauthbl.dqs.spamhaus.netIPsspam−22Critical
Spamhaus DQS ZRDzrd.dqs.spamhaus.netDomainsspam−18High
Abusix Mail Intelligencelookup.abusix.emailBothspam−18High
IPQualityScoreipqs.ioBothfraud−20Critical
Cisco Talos Intelligencetalos.intelBothspam−22Critical
Validity Certificationvalidity.comBothspam−20Critical
SURBL Commercial APIapi.surbl.orgBothspam−20Critical

Generated from the same catalog the checking engine uses, so this list is what actually gets queried. Higher plans add the commercial feeds; the free tier already covers 40 of them.

Questions

Blacklist monitoring, explained.

How many blacklists are checked, exactly?
45+ sources: 42 classic DNS blocklists (34 IP-based, 9 domain/URI-based, 5 covering both) and 6 commercial reputation APIs, Google Safe Browsing, Cisco Talos, Validity, IPQualityScore, Abusix and the SURBL API. Which vendors run for your assets depends on your plan; premium feeds like Spamhaus DQS come with paid tiers.
How is the 0-100 reputation score calculated?
Every asset starts at 100. Only confirmed listings deduct points, weighted by the list’s importance, the severity of the listing and how much we trust the answering resolver. A Google Safe Browsing hit deducts 30 points on its own. Inconclusive lookups add at most a small uncertainty penalty, so flaky DNS never tanks your score.
When do checks actually run?
Three triggers: a full scan the moment an asset is added, scheduled rechecks on the interval you set, floored by plan (30 minutes on Free, 15 on Professional, as fast as every minute on Business and Enterprise), and manual re-scans whenever you want one, with a short cooldown to protect the resolvers.
What happens when a listing is found?
The score drops, the listing appears with the exact zone and evidence, and an alert fires to your configured channels. You get a guided delisting path for the specific vendor, and monitoring confirms automatically once the delisting goes through.
Can I monitor sending IPs, not just domains?
Yes. Domains, subdomains and IPs are first-class assets. IP assets are additionally checked for PTR and forward-confirmed reverse DNS, which many receivers treat as a basic hygiene signal.
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