Fix PTR, A, and HELO identity before Spamhaus’s November 2026 DNS rollout lists you for gaps.
For mail admins and ESP operators. Self-report PTR/HELO/IPv6 posture, get a remediation path and ship checklist. We do not run live DNS — use Spamhaus’s official checker for lookups. Browser-only, nothing uploaded.
November 2026 window
Spamhaus describes gradual enforcement of valid HELO, PTR, and matching A records for sending IPs.
Remediation path
Generic hosting PTR and placeholder HELOs get explicit fix steps — not just a pass/fail.
Complements official checker
Use their HELO/DNS tool for live queries; use this page for operator runbooks.
Open the checklist
Answer a few questions. Copy your path and ship checklist.
How to run it
Step-by-step release runbook beside the wizard.
Use cases
Real operator scenarios with who / task / steps / result.
FAQ
Boundaries, privacy, and what this is not.
What this covers (for implementers)
- FCrDNS — PTR to FQDN that resolves back to the same IP.
- HELO — hostname resolves to connecting IP and stays consistent.
- IPv6 — allocation and reverse DNS minimums in Sender Guidelines.
- Not covered — live DNS queries, delisting tickets filed for you, or legal advice.
Not legal advice. Not affiliated with named vendors. Re-read live official docs the week you ship.