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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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PTR record for a WAF

I have a website behind a WAF. The WAF host is used for mail-sending activity. Our team informed me that the host IP address does not have a PTR record configured. I understand that it is a ...
Yasmeen Ali's user avatar
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IPREV check failing on multiple ipv6 addresses

I'm using a Raspberry Pi 5b running Ubuntu to host a Postfix and Dovecot mailserver from my home. After setting up various sender authentication mechanisms on the server eg. SPF, DKIM and DMARC - and ...
Oliver Ricketts's user avatar
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Proper rDNS in a multidomain server using the same IP

I have a server with one IP 92.150.180.250. I have 60 accounts. The host name is 92-150-180-250.hosted-by-myserver.com and the rDNS is exactly the same. All domain DNS records are following the ...
Νικηφόρος Μπάφας's user avatar
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Why is PTR needed in DNS, instead of using a service record or an MX record?

Why would an organization with an email system have a requirement that a system sending email to it needs a PTR reverse lookup DNS record of the IP address of the sending email server? Can the ...
ARGYROU MINAS's user avatar
1 vote
2 answers
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PTR record with multiple sending domains

We have a set up with two dedicated IP addresses that send e-mails from multiple domains. As an example, the dedicated IP addresses are 192.0.2.1 and 192.0.2.2, and the domains are example.com, ...
greymonkey23's user avatar
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How to add a PTR (Reverse DNS) on Vultr? Do I need to contact them?

I have set up a Postfix Dovecot email server on my Vultr. And I'm getting following message from Google: gmail-smtp-in.l.google.com said: 550-5.7.1 Our system has detected that 550-5.7.1 ...
岁月倾城197's user avatar
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Postfix - can't send emails to gmail addresses via terminal

I have the following errors when trying to send emails to gmail addresses via my terminal: sudo tail /var/log/mail.log Jul 19 13:19:44 ubuntu-4gb-fsn1-1 postfix/cleanup[5780]: B4B8C5F4A3: message-id=&...
Run's user avatar
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Why is bind9 not responding to reverse zones to anyone?

There is BIND 9.11.5-P4-5.1+deb10u2-Debian (Extended Support Version) <id:998753c> for the local network, it works as a caching server and holds several domain zones. Recursive requests are ...
Max Fetcher's user avatar
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2 answers
266 views

Correct hostname/PTR/A for a mail server serving multiple domains?

I am amalgamating a few of my company's Debian VPSs into 1. I will be serving multiple domains, as well as their sub-domains, all of which will send emails, but not receive them (except for bounces): ...
zorkwarrior's user avatar
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Gmail not detecting PTR record from vultr server

I have an SMTP server running on a vultr VM. I've set up the rDNS to point to my mail domain name mail.idimitrov.dev. The DNS setup points to that machine on ipv4 and ipv6 for mail.idimitrov.dev and ...
Ivan Dimitrov's user avatar
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Unsure on how to fix PTR [closed]

I am trying to setup a custom email for a company website. The only issue is that when sending an email to a gmail account, I get the following back: The mail system : host gmail-smtp-in.l.google.com ...
Learner's user avatar
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GCP/Google DNS: delegate a subdomain and set PTR records on VM instance

I am having a hard time figuring out what steps are needed to set a PTR record on a VM since I want to run a mailserver on it. My scenario looks like this: (unfortunately because of planned migration)...
mr.szop's user avatar
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how can i reroute incoming connection without passing it from my server

here is whats happening i ran a openvpn server on a server outside my coutry and tunneled it using stunnel from a server inside country(because of vpn restrictions i cant connect to it directly) but ...
IMIEEET's user avatar
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PTR registers for CNAMEs

In my bind9 DNS server, I have my servers described like this: [...] prd1frm201 IN A 172.21.10.2 dns IN CNAME prd1frm201.kprd1. ntp IN CNAME ...
Gilberto Martins's user avatar
1 vote
2 answers
903 views

2 IP's with the same PTR record?

Can I have 2 IPs with the same PTR Record? For example: 122.122.122.1 with PTR Record mail.example.com. 122.122.122.2 with PTR Record mail.example.com. Each IP-address is with a different ISP, the ...
Jorge Enrique Garzon's user avatar
6 votes
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12k views

Gmail does not accept mail from a new VPS server with PTR setup

I have PTR records setup but I am not able to deliver mail to Gmail accounts: host gmail-smtp-in.l.google.com[2607:f8b0:4004:c08::1b] said: 550-5.7.25 [2a01:4ff:f0:a7b6::1] The IP address sending ...
pwz2000's user avatar
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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 ...
Synopsis's user avatar
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1 answer
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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 ...
Santosh Baruah's user avatar
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1 answer
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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, ...
QF0's user avatar
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-2 votes
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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 ...
Al Klimov's user avatar
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5 votes
2 answers
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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....
rgb255_255_255's user avatar
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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 ...
Adam's user avatar
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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 ...
William's user avatar
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1 answer
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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 ...
Glenn's user avatar
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2 answers
459 views

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,...
jenszo's user avatar
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0 answers
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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 ...
Jack_Hu's user avatar
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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 ...
Flaviu's user avatar
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1 vote
3 answers
920 views

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 ...
saki's user avatar
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2 votes
1 answer
158 views

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 ...
jstuardo's user avatar
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1 answer
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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. ...
Okok's user avatar
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1 vote
3 answers
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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 ...
mfarazk86's user avatar
-1 votes
1 answer
5k views

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 ...
user6031824's user avatar
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1 answer
924 views

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 ...
AndrewL64's user avatar
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2 answers
2k views

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: ...
scoulomb's user avatar
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0 votes
1 answer
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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 ...
Henry's user avatar
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0 votes
1 answer
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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 ...
facechomp's user avatar
3 votes
1 answer
3k views

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 ...
jamacoe's user avatar
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0 votes
1 answer
4k views

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....
CopBlaster's user avatar
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248 views

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 $...
user3520245's user avatar
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1 answer
218 views

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 ...
jamieburchell's user avatar
2 votes
0 answers
1k views

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 ...
Amos's user avatar
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0 votes
2 answers
237 views

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 ...
raicho's user avatar
  • 103
-5 votes
2 answers
670 views

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. ...
Robert Jones's user avatar
0 votes
1 answer
2k views

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 ...
zigojacko's user avatar
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1 vote
1 answer
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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 ...
Jerome's user avatar
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0 votes
2 answers
246 views

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 ...
Ashkan's user avatar
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1 vote
2 answers
1k views

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, ...
user avatar
3 votes
2 answers
6k 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 ...
JDS's user avatar
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6 votes
2 answers
11k views

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 &...
Devin Blagbrough's user avatar
1 vote
2 answers
5k views

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 ...
Wodel's user avatar
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