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Questions tagged [ptr-record]

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

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reverse DNS (bind) for single ip/machine on non-private network

I have a simple problem: my DNS does not answer a reverse lookup of my public ip address (e.g. 11.22.33.44) correct ... it just answers SOA and NS (taken from SOA record), but no PTR (additional extra ...
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SPF Too Many DNS Lookups issue

In our scenario, We're running into an issue with our SPF records in route53. We are receiving SPF Too Many DNS Lookups because we are using multiple mail services. Is there a way to resolve this? I ...
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email validation: is there any point doing both SPF *and* reverse DNS tests?

For a receiving MTA, it seems to be unnecessary to check both the SPF record for an incoming SMTP connection, and to do an rDNS/PTR lookup. Consider: Server gets SMTP connection from aaa.bbb.ccc.ddd, ...
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Separate eMail relay: DNS requirements beyond PTR record?

Some cloud business offers "always-free" VM instances. Not quite big, but enough for me, so I’m going to migrate my infrastructure there, including mail.example.com. That machine handles ...
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How to confirm who is responsible for serving reverse DNS (PTR) requests an IP block?

Before anyone answers "ask your ISP" or "ask your hosting provider", please read in full. Scenario: I own a domain name mydomain.example, and a publically routed IP block (say 192....
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DNS PTR lookup deprecated?

When I use dmarcanalyzer to check my domain I get the message: Warning : You shouldn't use PTR lookups as they are deprecated My record looks like this: v=spf1 ptr:samplemail.com ip4:191.13.174.145 ...
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iprev check for multiple ipv6 addresses

Can I add multiple PTR records mapping multiple IPV6 addresses to the same domain, and add multiple AAAA records mapping the same domain to to the same set of IPV6 addresses, to let pass the iprev ...
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Is it possible to receive email for aliases of multiple domains on a single KVM?

Tl dr; Is it possible to receive email for aliases of multiple domains on a single KVM? I had a Digital Ocean server with multiple websites hosted on it, and needed email aliases of more than one of ...
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Iptable rules for SMTP NAT to borrow static public IP of data center server

I'd like to run my own mail server on my (decent) home ISP connection rather than trusting my emails to any data center provider - mostly because I already have a machine running. Although in practice,...
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Do I need a PTR (rDNS [Reverse DNS]) record if using an SMTP mail relay (Mailgun, Mailjet, Send Grid, etc.)?

My cloud hosting provider wants to charge for setting up a PTR record, which I'm not up for. As I use Mailjet as an SMTP relay server, do I even need to have it setup? Or will all my emails reverse to ...
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Using own bind name server allowing reverse dns for own mail server

I successfully created my own email server running on Ubuntu but other mail servers refuse incoming mails from my server because there is no reverse dns (PTR record). The configuration looks like own ...
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3 answers
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Subdomain, PTR and MX Record Confusion

I am lost in DNS and rDNS (PTR) record setting for the following scenario: I have my main website example.com running in Digital Ocean at IP 192.0.2.4 In Digital Ocean control panel I have the ...
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1 answer
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Reverse DNS record is not recognized

I have a problem creating a reverse DNS record. First of all, I have created a new zone. IP was aaa.bbb.ccc.ddd and Domain was ccc.bbb.aaa.in-addr.arpa. Second, I have edited the just created zone and ...
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PTR recored Issue

We have 2 Mail servers ( Internal and External) the External is hosted by ISPA with ip address of 62.xxx.xxx.xxx, we use to have the internet from the same ISPA, and the PTR record is already setup. ...
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450 4.7.25 Client host rejected

On #Exchange2013 I am getting the error message as follows, generated the error '[{LRT=};{LED=450 4.7.25 Client host rejected: cannot find your hostname, [xxx.xxx.xxx.130]};{FQDN=};{IP=}]'. I am ...
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ptr-record in Bind9 [closed]

I have att small business internet and trying to avoid paying them 50 bucks to make ptr-records as I need them. I am pretty sure this is corrrect, though it seems like they might have a block or some ...
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Reverse DNS PTR record

I have a dedicated server (Ubuntu 18.04 with virtualmin & webmin) which is hosting 7 WordPress sites on it. I have set up MX, DMARC, SPF and DKIM records for each one of them but dns tests online ...
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MX record in a reverse zone

I am taking a DNS course on Linux Academy. In one of the lab, they define a reverse zone. In this zone they add MXs records. Does it make sense to have MX record defined in a reverse zone? Details: ...
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| rDNS | IP gets resolved with a wrong hostname

I've been trying to set up rDNS so my IP could get resolved to my hostname in a program which has a built in rDNS lookup feature. I had done everything I was suggested (ask my ISP to make a PTR record ...
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Unknown PTR record in DNS; it’s not there in Cloudflare DNS Settings [closed]

(1.) There is an extra, unwanted, unexpected, unadded PTR record in my DNS settings, with value set to the Domain Name "mediati.net". You can see it here in MxToolbox Reverse Lookup: MxToolbox shows ...
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Who is responsible to set up reverse DNS (PTR) for a domain, the DNS host or the MX host?

I have the dns for a domain on GoDaddy and the MX configured for Gmail. All set up ok with spf, dkim and dmarc, and all passes all online tests, beside: intodns.com reports this error for the domain ...
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What is Wrong with My Reverse Lookup PTR Record

I can't figure out why my PTR record does not work on my new server. This configuration worked on my old server and I already confirmed with my host that they added a record on their end so that 72....
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Should PTR for domain controller be automatically created?

Reverse look up for my domain controller doesn't work. Invoke-Command -Credential $Cred -VMName $vmname -ScriptBlock {Install-WindowsFeature DNS -IncludeManagementTools} Invoke-Command -Credential $...
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How does a PTR record help receiving mail servers detect spam?

Specifically, if I create a mail server with IP 1.2.3.4 and hostname bademail.example.com, and make sure I have a PTR record from that IP to that hostname, what has that achieved? In a real world ...
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When sending an email to Gmail, I get a delivery error email back to me

I have a VPS and when I send an email, I get a delivery error email with one of the following (the email is not in the spam, it is not being sent at all): all hosts for 'gmail.com' have been ...
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Scrape subdomain IPs using PTR records

I'm looking for a solution to an obscure problem. For security policy reasons we have a workstation using PeerBlock with a block list that essentially blacklists the entire internet, and then an allow ...
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domain name system - rDNS is not exist [closed]

I need some help with Reverse DNS as I have got a problem with it. I have setup rDNS on my hosting provider which I use rdns1.example.com and I have a server hostname which it is gateway1.example.com. ...
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Setting up a global PTR record for entire server

Digital Ocean droplet running CentOS 7 with Plesk Panel installed. Trying to improve the email deliverability and overall state of the mail server. Want to set up a PTR record and apply this to the ...
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Reverse DNS PTR entries matching to MX entries

Confusion over what reverse DNS applies to and where it gets set... Although there are answers on how to do this, I still cannot determine what needs to get done and why. A domain is registered at ...
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Different PTR record resolve in DNS my DNS server and the public DNS server

I have created a PTR Record for Mail matters on my DNS server which can be seen as public. But after a day it is not recognized by mxtoolbox.com. I have checked every possible syntax errors but there ...
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Google Cloud Compute Enable PTR Record - Invalid value for field 'resource.publicPtrDomainName

I have followed the proceedure in google cloud documentation...https://cloud.google.com/compute/docs/instances/create-ptr-record verify domain ownership (done and verified) in google cloud console, ...
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3 votes
2 answers
5k views

Windows AD DNS is automatically adding PTR records for CNAMEs and I want this to stop

Preface: I am not a Windows admin. I am a Linux admin. I have a Windows 2016 server with AD DNS that handles internal DNS forward and reverse lookups. Somewhere, somehow, some process is ...
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Entering multiple DNS TXT values as a single TXT entry, with each value in " marks, but separated by spaces

I have done this with other DNS providers but I'm stuck on UltraDNS's DNS management interface. I need to enter multiple values in a TXT entry so they resolve as a single string with each value in &...
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2 answers
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Single DNS and E-Mail server with multiple public IP addresses

On our site we have two internet providers, with public IPs on each link. We manage locally our DNS and SMTP server. We want to publish our DNS and SMTP server on both links, to get redundancy. My ...
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Which domain should the IP PTR record resolve to?

I am trying to set up a mailserver alongside my webserver, example.com, at IP address 192.0.2.1 I have installed the usual suspects; Postfix, Dovecot, Roundcube, ClamAV milter, and OpenDKIM. I ...
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Google cloud load balancing and reverse DNS

I have a domain example.com pointing at a Google Cloud load balancer. Requests get served by one of several Compute Engines behind the load balancer. The load balancer ip is 1.2.3.4 Now when I send ...
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-2 votes
2 answers
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Setting up email server SPF without access to IP PTR

What is or is there a proper way to set up SPF without setting the IP's PTR? because I don't have access and want to know if there's an alternative method
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new email send to Outlook.com never deliver but reply on Outlook.com email does

I dont know where i could start. There is the probleme. If someone send me an email from Outlook.com, i received the email. If i reply, he will received my email. If i write a new email and send it ...
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How delegate the reverse DNS lookup to another name server?

Consider this scenario: A VPS server with one ip address (1.2.3.4) running "bind name server" to resolve requests. An organization which gave that ip address to the VPS server. Obviously the ...
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Multi-view DNS PTR issues

I am seeing some problems with PTR zone resolution, and I can't quite figure out what is not configured correctly. Summary: 1) I've been delegated authority for my PTR zone (246.237.204.in-addr.arpa,...
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bind9 on server locally for mail ptr record with cloudflare as name servers

I am using cloudflare's name servers for example.com with a cname for www - these are filtered through cloudflare. In cloudflare, I have an mx record pointing to mail.example.com and a mail A record ...
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2 votes
3 answers
4k views

How to know if reverse PTR record is correct for emailing purposes

I send emails for test@example.com with my own server. When using dig -x xxx.xxx.xxx.xxx with the IP of my server, I get: ;; QUESTION SECTION: ;xxx.xxx.xxx.xxx.in-addr.arpa. IN PTR ;; ...
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Reverse PTR record lookup not working with dig

As mentioned here, having a Reverse PTR record is key for successful email sending and delivery from one's own server. In order to check if it's correctly set for my server, I tried: dig -x 111.111....
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1 answer
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BIND9 can't resolve in-addr arpa

I am trying to configure my nameservers to resolve a PTR zone for which we are authoritative. I have several forward zones that work just fine, but when I try to resolve a PTR, the result does not ...
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1 answer
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PTR record won`t update

Currently, my server is running Ubuntu Server. I had the domain "rosresurs.msk.ru". A bit later I've bought a new domain called "rosresurs.net". But when I ran dig command, I saw, that old domain is ...
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How to allow rDNS(PTR) record to point a specific domain?

Maybe it sounds too complicated, but I will do my best to explain. The problem is the following: some domain is pointing my servers IP address. How can I block that rDNS (PTR) record, so I can attach ...
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Delegating reverse dns records - Bind (Ubuntu Server)

I have got a mail server attached to a static provided by my ISP. Our dns service is run by buddyns DNS service because our ISP blocked 53 by default. The DNS service is excellent, but i dont know how ...
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3 answers
2k views

BIND DNS: how to override RR generated by $GENERATE directive?

I'm running an authoritative nameserver for a reverse /16 zone, where every IP is mapped to a custom subdomain. This is achieved by a zone file with 256 $GENERATE directives, for example (subnet 11.22....
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How to set reverse ptr in azure Cli?

I'm trying to add reverse ptr on my Azure VM server. I tried via powershell and now I'm trying CLI direct on Azure panel. NOTE: My VMs are static ip. az network public-ip update --resource-group ...
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how to properly configure DNS when server hosting one domain is sending mail from another?

i'm trying to figure out how to properly setup TXT and PTR records in the following case: - one domain is hosted on the server 1stdomain.com on IP 1.2.3.4 - it uses remote mail server for sending ...
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