PTR Record Checker
Enter your sending IP. The tool returns the PTR record, validates it matches the forward (A) record for the sending hostname, and flags missing or mismatched PTR.
Reverse DNS lookup on the sending IP. Forward lookup on the returned hostname. Compares the two. Flags the FCrDNS mismatch that many MTAs treat as a hard reject signal.
Setting up a new self-hosted MTA. Diagnosing why mail from a dedicated IP suddenly hit spam after weeks of fine delivery.
FAQ
Who sets the PTR record?+
Your IP provider (hosting company, ISP, dedicated-IP provider). You can't set it from your own DNS — you have to request it via the provider's control panel or support.
Keep going
Articles, glossary entries, and other tools on the same topic.
You validated the setup. Want the live monitor that watches it forever?
One-time validation catches today's misconfiguration. Outsolvi watches every send forever and flags the day your record stops passing, the day a sender goes rogue, or the day a bounce pattern shifts. From $7/user/mo yearly.
Switch on continuous monitoringNate built Outsolvi after watching every email-tracking tool he had ever used lie to him about opens. Outsolvi runs Tier 1 to 5 confidence scoring on every open, native in Outlook and Gmail, so the number on the dashboard is one a rep can actually act on.
We update these pages when the underlying mechanics change — new mailbox-provider rules, new tracker behavior, new measurement gaps. The dates above are real revisions, not auto-touches.