PTR is a type of record in DNS system used for reverse DNS lookups (IP address to hostname)

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Is it ever preferable to have a server without a DNS PTR record? [closed]

Other questions on this site explain why it's helpful to have a PTR record, and why it's unhelpful to have multiple of them. Are there any real-world situations where a server with one or more A ...
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How to create RDNS (Reverse DNS) [closed]

How to create a RDNS (Reverse DNS) in centos or Ubuntu [PTR record] I searched a lot in Internet and didn't find any solutions. I got a idea it can be done by BIND or BIND9. In some forum i seen ...
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Multiple Domains on one Server IP-Adress

i need some help. I would like to host my own Mailserver with two or more domains. But to dont get blocked on outlook.com for example. I need a PTR to every Mail-Domain to get a correct lookup. Can i ...
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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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195 views

No PTR record according to gmail

Recently, I installed iredmail on my VPS and configured DNS records (including ptr). It confirms nslookup: nslookup zelenin.top Name: zelenin.top Address: 191.101.251.182 nslookup -query=mx ...
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Best practices for managing the IP addresses you own in DNS and their PTRs?

I was wondering how exactly the big companies go about managing all the IP addresses that their public servers use, especially in respect to setting up correct PTR-records. This is very important, ...
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PTR record format for IPv6

What is the difference in the following two IPv6 PTR formats? 4.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0 IN PTR smtp.example.com. 4.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.3.0.0.0.0.a.4.f.7.0.6....
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Configuring rDNS and PTR Record [duplicate]

I know that here was a few questions about it, but they didn't answer my question. Here is my issue. I have a mailserver on my dedicated server with full access. In robots I wrote down these lines of ...
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212 views

Outgoing mail fails to be received by Gmail. Rejected because PTR record does not mach forward lookup

My mail server has been sending mail with no rejections from gmail until recently. No changes have been made that I am aware of. Recently my outgoing messages are failing with an error about a "...
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64 views

Format for/creation of PTR and SPF records?

Let's say that I have a server that resides at Linode that I use for my business, mybusiness.com. It has an IP Address of 1.2.3.4, and an A record of myserver.mybusiness.com. I own the domain name ...
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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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147 views

Cant send mail due to PTR Records

I just installed sendmail on ubuntu 14.04 lts and configured a new domain. Somehow I must have overseen a config issue, as google mail is rejecting the message. looking at return message it tells me ...
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391 views

554 Bad PTR Record but Record exists and is correct

I'm getting Error messages from my freshly setup Postfix Server about impossible connections like this. 554-kundenserver.de (mxeue005) Nemesis ESMTP Service not available 554-No SMTP service ...
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Reverse DNS lookups failing except when specifying my NS

When trying to perform lookups on IP addresses within our IP space, I'm getting NXDOMAIN replies unless I specify my server directly (not just from the local network but from external nets as well, so ...
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101 views

DNS-SD only discovering services correctly after dig -t any

I have several DNS servers configured for DNS-SD. I am able to register services without issue, however when I try to browse I get errors. I have been testing using dig: Browsing a local or remote ...
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Delivered to internal network by a host with no rDNS

Recently our emails started going to spam for recipients at Gmail and Yahoo mail. I ran a SpamAssassin test, and have found the following: pts rule name description 0.0 ...
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Reverse DNS in bind 9 failed and VPS

My Ip address is 1.2.3.4 (single ip for mail and dns server) and my domain name is example.com, I use Centos 7 and bind 9 output of command: `host 1.2.3.4` is: `Host 4.3.2.1.in-addr.arpa. not ...
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multiple ptr record in bind

I'm running some small ISP here and I own couple of IP ranges. I have given a few public IP addresses to some of my customer and they are running mail servers on them. They have demanded me to add ...
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2answers
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Reverse DNS is not a valid hostname [closed]

I help a friend run a server, which includes a mail server. http://mxtoolbox.com reports that our reverse DNS is not a valid hostname. The reverse DNS currently points to domain.com. Should it point ...
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1answer
150 views

Reverse DNS query of public IP returns localhost

I'm seeing this unusual behavior with reverse DNS lookups on this public IP Address: 222.253.228.79. Can someone explain what's going on? MXToolbox PTR lookup resolved localhost as the domain ...
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2answers
125 views

Reverse DNS show cname [closed]

I created a PTR record but it shows the this result: 88.7.4.62.in-addr.arpa. 86400 IN CNAME 88.64-27.7.4.62.in-addr.arpa. 64-27.7.4.62.in-addr.arpa. 86400 IN NS ns1.webaservers....
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641 views

Reverse DNS nslookup fail

I'm having the following problem with my DNS configurations. I need to set up my reverse DNS and I don't know how. 1 - # nslookup mx.websolutions.com.ar Server: 127.0.0.1 Address: 127.0.0.1#...
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What should my reverse DNS be for my inhouse email server?

So I have an inhouse exchange server for the domain visaustralia.com. (email addresses are email@visaustralia.com) And when checking the reverse DNS of my static IP address with http://www.whatsmyip....
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PTR Record setup with separate incoming and outgoing servers [duplicate]

The situation: Even though SPF, DKIM, and the entire mail formatting is optimized to score 10/10 on mail-tester, many outgoing mails are marked as spam in yahoo and outlook. The primary server sends ...
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Using PTR on SPF Record and Multiple Domain Pointing Single Server

Today I've checked my SPF is valid on some of the sites and invalid on some of the sites I've tested. Microsoft also couldn't see my SPF record for some reason while others can. (Sender ID ...
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PTR Record for Mail Server

Our email server is setup for Domain POP/ Mail Bagging with our ISP for receiving only. Our MX Record resolves to our ISP mail host address. We have 2 IP addresses (redundancy purpose), 1 from our ...
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Is having the same PTR hostname valid for multiple ip addresses? [duplicate]

Currently I have the following setup with two hostnames and two ips: cheeze1.mydomain.com IN A 123.123.123.111 111.123.123.123.in-addr.arpa IN PTR cheeze1.mydomain.com cheeze2.mydomain.com ...
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CloudFlare and PTR records for reverse DNS

OK so I'm having a hard time configuring reverse DNS for my website protected by cloudflare. Since cloudflare is protecting my server, it's their IP and NOT the real server IP's that shows up when ...
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266 views

Trying to set PTR on CentOS 6.5

For the last 6 hours I've been trying to set a PTR for my server but I with no luck. Checking with host give me: Host 44.244.208.173.in-addr.arpa. not found: 3(NXDOMAIN) My /etc/named.conf includes ...
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Configuring Reverse DNS on Windows Server 2008, can't send email

I run a VPS on a Windows Server 2008 machine, and since I got it in January 2015 everything has been running fine, the server has IIS, DNS, and uses Mailenable for email exchange. I've been running ...
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Can I setup the PTR records of reverse DNS with different IPs?

I am very new into the Linux world. I'm trying to configure 3 Authoritative-Only DNS servers. I got everything set up, except for the zone of in-addr.arpa. I have the following servers with the ...
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SMTP DNS Validation with multiple mail servers behind multiple Public IPs

I know when a Mail server receives an e-mail, it performs a "DNS 3 way check" (I think this is also sometimes called FCrDNS) as a simply test against spammers. The way I understand it to work is as ...
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my host has no PTR record [closed]

when i check my host i get this host myIP xx.xxx.xx.103.in-addr.arpa has no PTR record So i dd this to my /var/named/domainname.com.db myHostname. IN A myIP xx.xxx.xx.103.in-addr.arpa. IN PTR ...
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Do I need to Set-up PTR record in SPF Setting?

I have set-up the RDNS from my hosting provider for the ip address to resolve to "maximus.example.com". After that, do I also need to add the PTR records to the SPF Text details in my DNS zone file as ...
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Is it possible to set a PTR record for Github Pages hosting?

Icelandic domains (.is) require that their domains support reverse DNS, which means configuring PTR records on the hosting server. Is it possible to set up a PTR record for GitHub Pages site hosting? ...
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PTR for Linux VM on Azure

I have a Linux (Ubuntu) virtual machine running on Azure and this machine runs a website that sends email to registered users. This emails are greylisted on some mailning services. After some ...
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Reverse DNS record can't point to Domain name but it can point to IP [closed]

I am using parallels plesk for hosting my websites, Some days ago I tried to send emails from my mail server and the mails were going to spam,So i tried spam assassin to detect whats wrong. Here is ...
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3answers
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Is the Reverse PTR record fine

I've checked my email headers at http://mxtoolbox.com which says it is ok. But I'm not sure. MY server's FQDN is host.tariffplansindia.com and for my server's IP( 23.239.30.81) the reverse PTR record ...
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155 views

Appropriate PTR records for mail server [duplicate]

I realize this is a common question around here, but I'm having trouble understanding one part of it. I want to setup a mail server to send newsletters and other marketing emails for a few of my ...
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1answer
3k views

How to add reverse dns record on cloudflare [closed]

I need to set PTR record on my cloudflare account, because all outgoing mails are going to spam. I do not see ptr record in my cloudflare account. Can I use txt/srv record instead?
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Reverse DNS records not registered when using DHCP

I've stumbled upon a strange behaviour with Windows machines, which seems to be fairly consistent between all Windows versions from Vista/2008 to 8.1/2012 R2; it doesn't happen instead when using ...
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1answer
3k views

setting correct PTR record for domain and postfix email server [closed]

I have a problem where I recently figured out, that describes this output! What steps to do to set the DNS PTR record, is the IP in reverse in the name needed? The zone of my domain is: ...
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DNS issue mail server

I tried to find an answer to this one around with no luck so far. I am not a sysadmin, but I work with mailings and one of our server presents some issues. I do not have personal access to the server, ...
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RDNS_NONE from spamassassin result, when it should be positive

When trying to do a spam test on mail-tester.com, SpamAssassin is giving me RDNS_NONE result. Can't quite figure out why! The result I get: -1.274 RDNS_NONE Delivered to internal network ...
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PTR records are not valid. but they should be!! - PTR quandary

I have a perplexing problem from my point of view. Not a mail server expert though so here goes; Using mail-tester.com, done a spam test for my mailserver and it's telling my PTR record is invalid, ...
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reverse dns not propagated

I defined reverse dns zone for server muq.ac.ir in name server which responds to name resolutions for domain muq.ac.ir server. Then I add a ptr record for ip address 80.191.92.199 with value muq.ac.ir....
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PTR Webserver and Appserver

I'm a little confused about the setup of a PTR record for reverse dns lookup. We are hosted at Rackspace and we have a front end webserver and behind that an appserver. Users don't access the ...
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The correct PTR record in DNS

I'm confused with my DNS records. I own a domain (e.g. example.com).I've set A record for my SMTP server (e.g. smtp.example.com) for outgoing emails. The email address is (e.g. person1@example.com)....
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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 ...
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What is the safe as AAAA record [closed]

What is safe for AAAA record. Short or full format? I set this e.g.: 4a01:20:18:0:5:8:8:30 This is IP from mail server. But when smtp sending email out i see problems in logs. Gmail return email as ...