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14
votes
4answers
4k views

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 ...
9
votes
2answers
17k views

How do I check a reverse PTR record?

I need to check a reverse PTR record to make sure that a script I have is sending emails which will actually received by my users and not incorrectly marked as spam. I understand that the ISP which ...
8
votes
5answers
6k views

How important are PTR records for Email Servers?

Does anyone know of any studies done to show how much email will be rejected if there is not ptr record for the SMTP banner name of an email server? Are reverse checks always done when enabled, or ...
6
votes
2answers
3k views

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 ...
5
votes
3answers
29k views

How to setup PTR (Reverse DNS) at Godaddy DNS manager

My hosting provider already did PTR setup. Now i have to setup it at my DNS holder i guess. What am i supposed to do at my Godaddy account. thank you. my ip : 64.250.113.235 and you can check my ptr ...
5
votes
2answers
1k views

Are PTR records added only by the ISPs that provide and manage the IPs?

I am administering a network with many locations and work with multiple providers I checked out with my DNS provider to change the PTR records for one of the IPs, they replied: Dear Sir, We ...
5
votes
5answers
836 views

Importance of PTR records on nameserver IP's?

I have not yet experienced any DNS failures due to a missing PTR record, but am wondering: Is there any added value in having a valid PTR record on a nameserver IP-address?
5
votes
2answers
244 views

How to determine which DNS server has the authority to set rDNS (PTR records)?

or to re-phrase... How to determine to whom authority has been delegated to set rDNS? Background In a multi-tier environment, where a block of IP's is assigned, then further split and assigned ...
4
votes
3answers
172 views

What services require properly configured PTR records?

I manage a few DNS servers (Bind9, Windows Server 2008 R2) that are used internally. I have always taken the time to make sure that the correct corresponding PTR records were configured for Reverse ...
4
votes
2answers
701 views

How are DNS PTR records managed?

As I understand it, an IP address-owner can set up a DNS PTR record for his IP address to map the IP addresses to its host names. There are some things about this I don’t understand. I’ve managed ...
4
votes
5answers
16k views

SMTP Reverse DNS Mismatch

My dedicated server ns382087.ovh.net resolves to 46.105.98.72 and hosts multiple domain with several dedicated IP addresses. Each new IP address is added to /etc/network/interfaces Among them, the ...
4
votes
2answers
7k views

how to add a REverse PTR Record on Amazon Route 53?

if i have the below ip 168.144.254.X and i would like to add a ptr record in amazon in the form of X.254.144.168.in-addr.arpa what should be in the name field and what should be in the value field ...
3
votes
6answers
2k views

Does a PTR record prove anything about the sender's email domain?

My outgoing mail server has problems reaching some recipients. This happened after we changed ISP for our dedicated IP address. I think it might be due to PTR records, but I cannot be sure. My ...
3
votes
3answers
1k views

Moving from one ISP to another; DNS PTR question

We are going to be moving from one ISP to another in the next month or so, and I will be changing the TTL's down to 60 seconds on the DNS servers that I have authority for, but our current ISP has ...
3
votes
5answers
906 views

DNS, PTR, Mail Server HELP!

I am not really sure which route to take. Here is my current setup. We host our web server on RackSpace Cloud (moved from EC2) Previously we hosted our own name servers, now we use RS (RackSpace) ...
3
votes
2answers
3k views

PTR record (rDNS) for multiple domains on a shared IP address

I host multiple domains on a single IP address: cats.com A @ --> 10.20.30.40 A mail --> 10.20.30.40 MX @ --> mail dogs.com A @ --> 10.20.30.40 A mail --> 10.20.30.40 MX @ --> ...
3
votes
4answers
1k views

How to determine if my mail server is configured correctly?

Does anyone know of an online service (similar to the ones that tell you if a site is up or down) that can connect to a specified mail server and perform checks to see if it is configured correctly? ...
2
votes
4answers
3k views

How do you know if reverse dns is setup correctly on your server

Total newb question I know, but I just want to be sure.
2
votes
2answers
202 views

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 ...
2
votes
2answers
548 views

Configuring PTR records!

One of our client requires PTR records to be configured. Their ISP does not support the same. Can I create a PTR record on my name servers for an IP owned by a different ISP?
2
votes
3answers
3k views

DNS PTR record when domain on shared IP address

I own a typical shared IP hosting plan and domain. I can modify the DNS of the domain from the control panel. The mailserver shares the same IP address, so my typical DNS config is: www.mydomain.com ...
2
votes
1answer
87 views

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? ...
2
votes
1answer
173 views

PTR record needed? Where?

I have a problem which I think can be resolved by adding a PTR record. Email isn't working for xx@example.com. I looked up the SMTP issues on mxtoolbox.com which returned the following: SMTP ...
2
votes
2answers
909 views

PTR and A record must match?

RFC 1912 Section 2.1 states the following: Make sure your PTR and A records match. For every IP address, there should be a matching PTR record in the in-addr.arpa domain. If a host is ...
2
votes
1answer
1k views

My ISP set up a PTR record for my mail server, but some places aren't seeing it

I have a VPS running Windows 2008 server with plesk 9, which I am using for email. I asked to my ISP to add a PTR record, which they did but my mails still droping into spam box. I have checked ...
2
votes
1answer
80 views

$GENERATE'd records competing with real PTR records

I have a zone (1.168.192.IN-ADDR.ARPA) $GENERATEing PTR records from 1-254. However, I also have some custom PTR records, within that range, that are declared aside from the generate directive. ...
2
votes
2answers
1k views

How to add PTR record for a /16 IP block in BIND using $GENERATE directive?

I'm trying to reverse map a block of IP using PTR record to some special name so their usage can be easily reflected by a simple nslookup. For example, here's a nslookup result: # nslookup ...
2
votes
1answer
39 views

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 ...
2
votes
2answers
10k views

How should I set up my PTR Record?

I am trying to properly set up my ptr record as I have noticed that some email notifications sent from my website have gone to spam for certian people, and I am having trouble figuring out exactly ...
2
votes
1answer
50 views

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 ...
2
votes
3answers
109 views

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 ...
2
votes
1answer
468 views

How to match PTR record with a different domain?

I am a bit confused about PTR records and how to set it up correctly. This is the current setup: A website: domain.com, on this website I have a mailaddress info@domain.com. On domain.com I have an ...
2
votes
2answers
287 views

A and PTR records and redundant Internet connections

Want to set up PTR record(s) to handle the following: Site with mail server (Exchange 2010) has three Internet connections, with the firewall handling load balancing. I know that if the Internet ...
1
vote
1answer
238 views

Where did dedicated.abac.net. come from in my rDNS and PTR records?

So I followed this guide to the letter: http://docs.cpanel.net/twiki/bin/view/AllDocumentation/WHMDocs/RdnsForBind I did so for 3 domains. When I "test" the records and enter: host 64.150.176.81 on ...
1
vote
2answers
935 views

How to set PTR record on Windows Server 2008?

I'm having some problems sending out emails from my SMTP Server... apparently I need to setup the PTR record for Reverse-DNS Lookups. I have no clue how to do this. Some instructions point ask to ...
1
vote
1answer
59 views

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, ...
1
vote
2answers
5k views

How do I set up a reverse zone file?

I have this zone file in bind: $TTL 86400 mysite.net. IN SOA ns1.mysite.net. admin.mysite.net. ( 2006012008 86400 3600 604800 86400 ) ...
1
vote
3answers
922 views

PTR record and dyndns

I have domain name at dyndns.com and set at home smtp server. I try send mail to other servers but get error: 550 We cannot accept email from IP 92.46.76.192 without a DNS PTR record. Contact your ...
1
vote
1answer
112 views

PTR record created, but not found

We are a small ISP, using linux DNS servers. Recently a client has asked us to create a rDNS zone for a specific IP address, which is used for a mail server. They keep getting message failures for ...
1
vote
1answer
811 views

Windows 7 PTR records with Cisco DHCP server

I would like to have my windows 7 clients register their own PTR records since I use a Cisco DHCP servers. DNS is Active Directory integrated. How can I go about doing so without setting up a ...
1
vote
1answer
226 views

One server, one external IP, several virtual domains --> one PTR?

I've got some problem with ptr and domains. Here is situation: external ip: 123.123.123.132 domain1: example.com domain2: elpmaxe.net mailserver is on exim4. PTR 123.123.123.123 matches example.com ...
1
vote
4answers
977 views

Is this PTR record / DNS set up correctly?

Received the following error from a user: WARNING: Forward-DNS does NOT match Reverse-DNS. DNS is INCONSISTENT. Some users are having their email marked as spam. I looked in the PTR records and ...
1
vote
4answers
1k views

Discover server responsible for serving a PTR for a specific IP?

Just as the title reads: How do I discover what nameserver is the authoritative nameserver for PTR records for a specific IP?
1
vote
4answers
2k views

DNS and PTR for SMTP: shared IPs and subdomains

This question is similar to others about PTR and DNS for SMTP, but one specific aspect was unanswered: what if one machine does SMTP and HTTP on the same IP address. For example: SMTP at ...
1
vote
1answer
88 views

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. ...
1
vote
2answers
69 views

Assist in diagnosing reverse dns mismatch

We seem to have an occasional issue, whereby mail is bypassing our first three MX records, and going to our 4th MX record. This is purely a backup, and we think that the reason it is skipping the ...
1
vote
1answer
55 views

Postfix sending emails via multiple broadband lines

I have a site that send out emails from a postfix server. They have multiple broadband lines for load balancing and failover. I want them to be able to send out emails though both lines without the ...
1
vote
2answers
599 views

delegating /24 and /64 reverse zones

I'm sure I'm overlooking something so simple, but I'm just not seeing it... I'm trying to delegate the /24 and /64 reverse zones for our Test network to hosts within the Test network. I'm seeing the ...
1
vote
1answer
393 views

PTR Record Troubles

I am having a hell of a time getting our PTR record right. Our current PTR zone looks like this: $ttl 38400 @ IN SOA ns1.domain.com. admin.domain.com. ( 1268669139 10800 ...
0
votes
3answers
3k views

Hotmail wants me to modify my SPF record

This is my current SPF record. It works well with gmail and yahoo but hotmail was ignoring. So i used their submit system and now they replied me with the text below. This is my current spf v=spf1 a ...