Questions tagged [fcrdns]

Forward Confirmed reverse DNS is the practice of using PTR records that are authenticated by matching A or AAAA records to demonstrate ownership of an IP address.

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Does FCRDNS need the RDNS to be the same hostname than the first forward query?

Does forward confirmed reverse dns (fcrdns) only lookup ip to hostname and then hostname to ip or does it compare to the first hostname as well (especially in spam filtering)? Let's say i have these ...
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Which DNS name is checked for TLS on a mailserver?

Let's say i have these records: A mail.somedomain: 127.0.0.1 A mail.mailserverdomain: 127.0.0.1 MX somedomain: mail.somedomain A MTA connects mail.somedomain for delivering mail to somedomain and ...
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FCrDNS for a mail server that also runs other services (http, ftp etc)

I am learning how to administer productive internet-facing machines and services, and towards that end setting up mail, web, and a couple other services, all on the same box (budget constraints and ...
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3answers
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FCrDNS With Separate Host and Mail Server

I have an "A" record on my DNS which points to an IP, specifically the IP my website is hosted on. I use a separate IP for my email server. This causes my emails to fail the Forward Confirmed Reverse ...
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3answers
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Why multiple PTR records in DNS is not recommended?

I often read that using multiple PTR records in a DNS configuration is not recommended. However, the reasons are often vague, or not so obvious, naming: "it can cause problems", "can trigger bugs ...
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1answer
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Do internet standards require reverse DNS for every device?

The requirements surrounding reverse DNS are confusing! People frequently talk about everything breaking if reverse DNS is not present, and that sounds scary. Even in cases where applications don't ...