How to resolve Validity sender score DNS lookup deprecation?
Updated on 8 Oct 2026: We clarified Validity's DNS access terms and added steps to prevent query-limit failures and incorrect filtering scores.
The fix is to identify the public source IPs that reach Validity's authoritative DNS and route production checks through restricted, caching resolvers that query authoritative servers directly. Confirm that Validity has approved your required query volume. Changing email authentication records will not restore this access.
The reported Sender Score DNS lookup deprecation is an access restriction, rather than the removal of every reputation lookup. Since March 1, 2024, anonymous DNS access has been limited to 10,000 requests in a rolling 30-day period. Traffic through shared recursive resolvers can reach that limit even when one sender makes few queries. If automation using score.senderscore.com stops returning useful scores, check its actual resolver path first.
- Run the lookup through the same resolver and network path that the application uses.
- Record the public source IP that Validity sees for each resolver.
- Use restricted, caching resolvers that perform recursion without forwarding Validity queries to public DNS.
- Compare DNS results with message tests, DMARC reports, bounces, complaints, and blocklist (blacklist) status.
What changed with Validity DNS access
For legacy IPv4 score checks, reverse the sending IP address, append score.senderscore.com, and query an A record. A successful answer encodes the reputation score in the response. The score.senderscore.com score zone and bl.score.senderscore.com blocklist (blacklist) zone return different kinds of data; do not interpret their answers interchangeably.
Example legacy lookup shapeBASH
# Documentation example only. Replace with your actual sending IPv4. # 203.0.113.42 is reserved for examples and is not a live score test. dig +short 42.113.0.203.score.senderscore.com. A
The 2024 announcement described registered access as free, but Validity's 2025 clarification set May 1, 2025 as the contract deadline for accounts exceeding the free allowance. Higher query volumes require a contractual agreement. Confirm the current quota and registration terms with Validity; creating an account alone does not guarantee unlimited access.
For affected Validity reputation DNS zones, an answer of 127.255.255.255 indicates excessive queries or blocked access. That address is an access error and contains no usable reputation data. Code and mail filters must exclude it from score and blocklist (blacklist) decisions.
Do not fix this in authentication DNS
Changing SPF includes, DKIM selectors, or DMARC policy will not restore Sender Score DNS access. Fix the querying path first. Review authentication only when message tests show a separate failure.
Sender Score by Validity IP reputation lookup form with contact details.
|
|
|
|---|---|---|
127.255.255.255 | Excessive queries or blocked access | Exclude the answer; verify resolver egress IPs and approved query volume |
NXDOMAIN or NOERROR without an A answer | No score data, wrong zone, or malformed query name | Verify the reversed IPv4 and zone; compare the same IP with the web result |
Timeout or SERVFAIL | Resolver, authoritative DNS, network, or DNSSEC validation failure | Inspect the full response and resolver logs; do not interpret it as a score |
Web score works, DNS fails | DNS access restriction, wrong query, or resolver failure | Check the response, resolver path, and access terms before registering IPs |
Common Sender Score DNS symptoms and their likely causes.
Web lookup and DNS access are separate
The Sender Score website and Validity's reputation DNS zones are separate access paths. The website accepts a domain or IP address and asks for contact details to return a score between 0 and 100 when data is available. The score describes a sending IP address, even when the lookup starts with a domain. Automated DNS queries are controlled according to the source IP and query volume seen by Validity.
|
|
|
|---|---|---|
Occasional manual check | Sender Score web form | A web result does not prove DNS access works |
Automated score lookup | Restricted, caching, non-forwarding resolver | Access depends on the public query source and volume |
Inbound DNSBL filtering | Mail filter through a controlled resolver | Access errors must not affect message scoring |
Choose the access path that matches the task.
This distinction explains why the website can show a score while a script returns no useful answer. Restore DNS access only for production jobs that depend on it, and use the website for occasional manual checks. Check the actual outbound sending IP in trusted receiver headers. If the sending service uses a shared IP pool, other senders using that IP also affect its reputation.
How to restore Sender Score DNS access
Treat this as a resolver ownership problem. Validity sees the public source IP of the recursive resolver, not the IP address being scored. When a script uses a public resolver, its queries share access controls with unrelated users. A low-volume sender can therefore receive an excessive-query response. A local resolver that forwards these queries to public DNS still uses the public resolver's allowance. Changing the provider that hosts your domain's DNS records does not change this recursive query path.
- List every application, mail filter, scheduled job, and report that queries a Validity reputation zone.
- Find each recursive resolver and record every public IPv4 or IPv6 source address it actually uses, including NAT and failover paths.
- Move production queries to redundant local caching resolvers that accept requests only from trusted hosts and do not forward Validity queries to public DNS.
- Submit every resolver egress IP through Validity's access process and arrange a contractual agreement if the required query volume exceeds the free allowance.
- After access approval, expire only the relevant cached error or wait for its TTL, then compare an explicit resolver query with the application's normal lookup.
Shared resolver path
- Validity sees the public resolver, not the application host.
- Unrelated users can consume the shared query allowance.
- Access failures appear unrelated to the application's query count.
Controlled resolver path
- Validity sees the public egress IPs of resolvers that perform recursion themselves.
- Usage maps to the organization's own automation and filters.
- Failures have a known owner and traceable DNS path.
Inspect status and TTL through the controlled resolverBASH
# Replace the example IPv4 and resolver with your actual addresses. # Keep comments, answers, and authority records to see status and TTL. dig @10.0.0.53 42.113.0.203.score.senderscore.com. A +noall +comments +answer +authority
Restricted recursive resolver pattern
# Minimal Unbound configuration fragment; adapt addresses to your network. # Check the rest of the configuration for forward-zone entries. # Validity queries must use direct recursion rather than public forwarders. server: interface: 10.0.0.53 access-control: 10.0.0.0/24 allow access-control: 0.0.0.0/0 refuse prefetch: no
Keep DNS lookups within the query limit
The 10,000-request allowance counts DNS requests, rather than emails. Spread evenly over 30 days, it averages about 333 requests per day, but the limit is a rolling total rather than a daily reset. A mail filter that checks multiple Validity zones can generate several requests for one message.
- Count requests that reach Validity across scheduled jobs, mail filters, and retries. Resolver caching means application lookup counts and authoritative query counts differ.
- Cache positive and negative answers according to their DNS TTLs, and deduplicate repeated checks for the same sending IP.
- Use retry backoff for transient failures and pause blocked lookups until access is resolved. Repeated polling does not remove a rate limit.
- Record lookup status and the last successful result time. Mark failed checks as unavailable and retained results as stale; never convert an empty answer or access error into a score of zero.
How to verify Sender Score DNS access
A working DNS answer does not prove good deliverability. Sender Score is an IP reputation signal. Mailbox providers also evaluate domain reputation, authentication, complaint rates, spam trap hits, bounce patterns, engagement, and recent volume changes. Use the score as one input, then validate the message path. Validity calculates most Sender Scores on a rolling 30-day average, separate from the DNS query allowance. Restoring lookup access does not reset the reputation score.
Start with a broad domain health checker pass so authentication problems are separated from reputation DNS access. Query a real sending IP through the controlled resolver and the application's normal path, then compare both with a manual web check for that same IP. Read the full DNS status; empty output from dig +short does not distinguish a missing score from a lookup failure.
Email tester
Send a real email to this address. Suped shows a results button when the test is ready.
?/43tests passed
After DNS access works, send a real message to an email tester and inspect the headers. DMARC passes when SPF or DKIM passes and its authenticated domain satisfies the DMARC domain-matching rule for the visible From domain. With relaxed matching, the domains share an organizational domain; strict matching requires identical domains. Verify that the authenticated identity belongs to the expected sending source.
Checks before opening an incident
- SPF, DKIM, and DMARC results come from a real message, not DNS records alone.
- The visible From domain, return path, DKIM d= domain, and sending IP are expected for the sending service, including any shared infrastructure.
- Blocklist and blacklist status agrees with bounce logs, complaint data, and recent sending behavior.
- Reverse DNS, HELO naming, resolver responses, and SPF lookup count are valid.
Treat SPF lookup errors and sending-IP identity problems as separate incidents. Use the SPF lookup limit guidance for authentication errors and the reverse DNS lookup guidance for sending-IP configuration.
SpamAssassin and receiver-side filtering
This issue also affects receivers that use Validity DNS zones in filtering rules. A blocked query can return 127.255.255.255. If a filter treats that access-control response as a real list answer, it can add or subtract points even though no reputation result was returned.
The Hestia thread documents this symptom with older SpamAssassin rules. Apache's current rules distinguish genuine Validity list responses from blocked-access notices. Update the installed rules with sa-update and validate with spamassassin --lint before changing local policy. If the installed rules still score access errors, suppress only the affected queries while arranging approved access.
Temporary SpamAssassin restriction
# /etc/spamassassin/disable-validity.cf dns_query_restriction deny sa-trusted.bondedsender.org dns_query_restriction deny sa-accredit.habeas.com dns_query_restriction deny bl.score.senderscore.com
Validate the local configuration with spamassassin --lint, then reload or restart the filtering service. Test a known message and confirm that access errors do not trigger reputation scores. A blocked-access notice still means DNS access needs attention, even when it no longer changes message scoring.
Use rule suppression as a temporary control
Do not leave reputation checks disabled without a replacement plan. Restore approved access or remove the rule weights intentionally after reviewing false positives, missed spam, query volume, and operational risk.
Monitor email authentication with Suped
Suped's DMARC reporting and email authentication platform supports the follow-up monitoring workflow: verifying domain authentication, identifying unexpected sending sources, tracking failure changes, and correlating blocklist (blacklist) events with email activity. Validity remains responsible for access to its reputation DNS zones.
Suped turns aggregate DMARC reports into source-level actions. DMARC monitoring shows which senders pass, which fail, and which need configuration work. Use source data and authentication alerts to investigate delivery changes alongside bounce logs and complaint data.
Suped DMARC dashboard showing email volume, authentication health, and source breakdown
Keep Sender Score in context with blocklist monitoring. A blocklist or blacklist hit is more actionable when it agrees with bounces, deferrals, DMARC source data, and a known sending change. Compare these signals before attributing a delivery problem to a Sender Score change.
How to interpret Sender Score ranges
Use Validity's published thresholds for triage, not as a final inbox-placement verdict.
Good
80+
Continue healthy sending practices and watch other delivery signals.
Fair
70 to under 80
Review complaints, unknown users, volume changes, and filtering.
Poor
Under 70
Investigate list quality, spam traps, blocklist status, and infrastructure.
Unknown
No result
Fix DNS access or confirm that Validity has enough data before interpreting it.
Views from the trenches
Best practices
Use restricted, non-forwarding resolvers so Validity sees query sources your team controls.
Register all resolver egress IPs and confirm that your approved quota covers query volume.
Treat Sender Score as one signal, then compare it with DMARC, bounces, and complaints.
Common pitfalls
Pointing checks at public resolvers hides your own usage and can return blocked answers.
Changing SPF or DMARC to fix this wastes time because the failure is resolver access.
Using outdated SpamAssassin rules can turn blocked queries into incorrect message scores.
Expert tips
Document resolver egress IPs, query volume, test commands, and the owner of DNS access.
Inspect DNS status and TTLs; mark missing scores as unavailable instead of setting zero.
Use Suped to track authentication and blocklist signals while reputation DNS is restored.
Marketer view
Marketer from Email Geeks says high-volume DNS access effectively requires registration, not a DNS record change.
2024-07-31 - Email Geeks
Marketer view
Marketer from Email Geeks says public resolvers can return unhelpful answers because the provider sees resolver IPs, not sender IPs.
2024-08-01 - Email Geeks
