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13
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2answers
1k 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 ...
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 ...
7
votes
2answers
12k 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 ...
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
795 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
173 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 ...
5
votes
2answers
735 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 ...
4
votes
3answers
23k 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 ...
4
votes
3answers
165 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
607 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
14k 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
6k 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
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
843 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
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
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 ...
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
540 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
2k 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
156 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@domain_a.com. I looked up the smtp issues on mxtoolbox.com which returned the following: SMTP Reverse ...
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
78 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
36 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
9k 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
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 @ --> ...
2
votes
3answers
87 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
330 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
216 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
213 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
897 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
50 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
4k 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
813 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
650 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
209 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
902 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
68 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
64 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
54 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
453 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
384 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
2k 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 ...
0
votes
2answers
380 views

which one is best for PTR record: domain or hostname

I have a VPS with the following IP: 82.197.45.124 domain: example.com hostname: server.example.com PTR record: 82.197.45.124 > server.example.com There is no an "A" record for "server" ...
0
votes
3answers
720 views

DNS A and PTR records

I tried doing some research but didn't find what I was looking. I have server (win2k8fs1). It is a static assigned IP and has an A record 192.168.x.x with the associated PTR record. Setup: a: ...
0
votes
1answer
59 views

Reverse DNS record can't point to Domain name but it can point to IP

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 ...
0
votes
2answers
85 views

PTR record only added on IP owner side? no in DNS Zone files?

i wanted to add PTR record, to my domain so the reverse IP is in PTR points to my nameserver. So on my hosting IP provider i set my nameserver for the IP and it now shows in PTR (i used this ...
0
votes
1answer
1k views

how solve ERROR: No reverse DNS (PTR) entries. The error MX records are:

i have remote access to my windows server 2008 r2(DNS-IIS-FTP-MAIL), please see the link below for my web site : http://www.intodns.com/polyafzar.com how can i fix the error below in my server : ...