How to use this check
Enter a public domain to resolve a bounded set of addresses and test them against an allowlisted DNSBL sample.
MailHealth resolves a few public A/MX addresses, blocks private ranges and queries only configured DNSBL zones.
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Reputation
Bounded DNSBL sampleBlacklist Check
Run a small DNSBL sample against public mail-related addresses with strict query limits.
Health score--Bounded DNSBL sample
Signal checklist
The result shows checked addresses, DNSBL zones, listed status and provider-limit warnings.
Blacklist Check
Enter a public domain to resolve a bounded set of addresses and test them against an allowlisted DNSBL sample.
Result
The result shows checked addresses, DNSBL zones, listed status and provider-limit warnings.
Support
Keep this free result available
Use the result first. Support and promotional areas stay separate from the useful result.
- Useful result first
- No signup required
- Promotions kept separate
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Guide and interpretation
How to interpret the result
A listed result is a signal to investigate the provider and sending IP; an unlisted sample is not a guarantee of deliverability.
Example
If one mail IP appears listed in a DNSBL, review recent sending patterns, compromised accounts and delisting steps.
Common issues and next steps
DNSBL providers can rate limit public resolvers or require direct policy review for commercial use.
Treat the free result as a pointer, then confirm directly with the listed provider before making operational claims.
Methodology and limits
This is not a universal blocklist audit; broad reputation feeds and historical monitoring belong in account features.
FAQ
Why only a DNSBL sample?
A small allowlist keeps the free tool useful while controlling abuse, provider policy and latency.
Does unlisted mean my mail will land in inbox?
No. Inbox placement depends on many sender, content, engagement and provider-specific signals.