Free Email Tool
Check the PTR record for any IP and verify forward-confirmed rDNS (FCrDNS).
Check the PTR record for any IP. A properly configured PTR that matches the EHLO hostname is required for deliverability to most ISPs.
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These tools help diagnose. Dedicated infrastructure fixes the underlying problem.
Talk to usA PTR (pointer) record maps an IP address to a hostname — the reverse of an A record. For email deliverability, the PTR record of your sending IP is checked by most major mail servers as a basic verification step. An IP without a valid PTR record, or with a PTR that doesn't forward-resolve back to the same IP, is a common cause of deferred or rejected mail that's easy to miss.
FCrDNS means the PTR record's hostname also has an A record pointing back to the original IP. For example: IP 203.0.113.1 → PTR → mail.yourdomain.com → A record → 203.0.113.1. This loop confirms the PTR is legitimate. Gmail explicitly documents FCrDNS as a sending best practice, and several DNSBLs (including Spamrats NoPTR) specifically list IPs that fail this check.
PTR records are managed by the IP owner — your server host or ISP, not your domain registrar. Contact your hosting provider and request a custom PTR (reverse DNS) record be set for your IP. The hostname should be meaningful: mail.yourdomain.com or smtp.yourdomain.com is ideal. All dedicated IP clients at Cloud Server for Email get custom PTR records as standard.
Yes. Generic PTR records are flagged by many spam filters as a signal of residential or shared hosting. While a generic PTR usually won't cause outright rejection, it can contribute to higher spam scores. Request a custom PTR from your IP provider pointing to a meaningful hostname under your domain.
Spamhaus PBL lists IPs that should not send direct-to-MX email — typically ISP dynamic and residential ranges. PBL listing is determined by the IP's network allocation, not its PTR record. However, a legitimate dedicated business IP with a proper PTR record is less likely to be in a dynamic/residential netblock. Check your IP against the IP Blacklist Checker to see if it's on PBL.
