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Prep Checklist

Reverse DNS works best when the hostname already resolves forward to your VPS. Create or update the A/AAAA record first so mail servers and reputation services see a matching pair.
  • 📌 Have the exact FQDN you want to publish (for example mail.example.com).
  • 🧾 Keep both IPv4 and IPv6 assignments handy—the Network tab lists them.
  • 🔒 Plan to use lowercase hostnames without trailing dots; the portal formats PTRs automatically.

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Update PTR Records in the Portal

1

Open the rDNS panel

Sign in to the EDBB VPS Portal, select your VPS under Services, and choose the rDNS tab.
2

Set the primary IPv4 hostname

Replace the default value with your hostname and click Set. Use Unset if you need to revert to the system default.
3

Add IPv6 reverse records

For each IPv6 address, enter the suffix (for example :1) and matching hostname, then press Add.
4

Review the summary

Confirm the updated entries in the list; edits take effect immediately on EDBB’s side.
Reverse DNS configuration tab with IPv4 and IPv6 PTR fields

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Verify & Troubleshoot

  • Use dig -x <ip> or an external rDNS checker after a few minutes—public caches may need time to refresh.
  • If the hostname doesn’t appear, double-check that the forward record exists and matches exactly (including subdomain).
  • Still seeing the old PTR? Clear local DNS caches or test from another network.
Reverse DNS updates for mail servers should be paired with SPF/DKIM updates. Mismatched hostnames can cause outgoing messages to be rejected or flagged as spam.