Automatic reverse DNS (PTR): a ready record for your mail-sending server

One of the most annoying problems for mail-sending servers is receivers rejecting mail because "your IP address has no reverse record". On Gyro Cloud Istanbul this is now solved from the start: every IP address comes with a ready reverse DNS (PTR) record.

What changed?

• Automatic record: your server's primary IP and every additional IPv4 you add has a PTR record in the form 203-0-113-10.ip.gyrohosting.com.
• Forward record is ready too: the A record of that name points to the same IP, so both directions confirm each other.
• Write your own name: for the address that sends mail you publish your own name such as mail.ornekfirma.com within seconds.
• Cleaned up automatically: when you delete the server or release an additional IP, that address's record is removed.

Writing your own name

First add an A record in your domain's DNS pointing the name to your server's IP, then write the reverse record:

gyro server rdns list 12345
gyro server rdns set 12345 --ip 203.0.113.10 --hostname mail.ornekfirma.com

You can also do it in the panel under Management → Network & Security → Reverse DNS; the API (PUT /cloud/servers/{id}/rdns) and Terraform (gyro_server_rdns) are supported as well. Names under Gyro domains and protected brand names are refused; at most 30 changes can be made per hour.

A short checklist for e-mail delivery

• Make the PTR name, the A record and the e-mail's HELO name match.
• Have SPF, DKIM and DMARC records on your domain; see SPF, DKIM and DMARC on Gyro DNS.
• For bulk mail you can use a separate IP (additional IPv4) and set its PTR separately.

Details: the Reverse DNS (PTR) guide. Product page: Gyro Cloud Istanbul.