Is this the official Spamhaus checker?
No. Spamhaus publishes Sender Guidelines and a HELO/DNS checker. This page is an independent static remediation checklist. Not affiliated with Spamhaus.
Why don’t you look up my IP?
Live DNS belongs to official tooling and your own dig/host workflows. Keeping this page static avoids pretending to replace their checker and keeps your IPs off our servers.
Will I be listed on November 1 automatically?
Spamhaus describes a gradual rollout over several months starting November 2026. Treat gaps as rising risk, not a single cliff guaranteed for every IP on day one. Still fix early.
Do checklist answers leave the browser?
No upload path is implemented. See privacy. We do not file delisting requests.
Is FCrDNS the same as “has a PTR”?
No. PTR must point to an FQDN that also has forward DNS back to the same IP. PTR alone without matching A/AAAA fails the forward-confirmed requirement.
What about COI / double opt-in?
Also required in Sender Guidelines minimums, but out of scope for this DNS-identity checklist. Handle list permission separately.