Question

Reverse DNS FAILED! This is a problem - test of the SMTP

Asked by: Mezczyzna

Hello,

Our Marekting Dept. changed suppliers hosting our website.
We started having problems receiving e-mail.
Errors on dnsstuff point to a missing A record.


ERROR: I couldn't find any MX records for domain.com. If you want to receive E-mail on this domain, you should have MX record(s). Without any MX records, mailservers should attempt to deliver mail to the A record for domain.com. I can't continue in a case like this, so I'm assuming you don't receive mail on this domain.

ERROR: I could not find any mailservers for domain.com.




I can only give 500 points but if I could I would give 10,000 for steps on how to create the MX record.
How should the Mail Exchanger (MX) record look in the Forward Lookup Zones for our domain.
Is this the correct place to do it?
Host or child I type www and in Fully qualified domain name appears www.domain.com
In the fully qualified domain name (FZDN) of mail server: text box should I type mailserver.domain.com?
Priority is set to 10.

In the existing www Properites for the FQDN is says www.domain.com and the IP is pointing to GoDaddy Ip address.
When I try to change that to the new hosting IP it gives me a Warning: The associated pointer (PTR) record cannot be created, probably because the referenced reverse lookup zone cannot be found.




DC DNS - Win 2003 Std.
Exchange 2007 on Win 2008.


How can I fix the issue, please?

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Asked On
2009-08-12 at 06:23:00ID24646310
Topics

Domain Name Service (DNS)

,

Exchange Email Server

Participating Experts
3
Points
500
Comments
22

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Answers

 

by: endital1097Posted on 2009-08-12 at 06:26:10ID: 25078462

you need to update your external dns with whoever maintains it
add an A record with the external IP address of you SMTP gateway/Exchange server
then add a MX record for you domain pointing to this A record

you will most likely need to contact your ISP and request an update of the PTR record to the FQDN of your mail server

 

by: MezczyznaPosted on 2009-08-12 at 06:35:25ID: 25078541


The external DNS is the guy hosting the website?

Do I add it in Reverse Lookup Zones?

 

by: endital1097Posted on 2009-08-12 at 06:37:47ID: 25078562

start with the hosting company for the A and MX records.

you'll most likely need to contact your ISP for the PTR record. typically they own the IP address and will update DNS when requested

 

by: MezczyznaPosted on 2009-08-12 at 06:45:39ID: 25078636

I understand the ISP role but the rest is not clear.
I'm sorry.

I have for Host (A) records:
mailserver Host (A)
terminalserver Host (A)
webmail Host (A)
www Host (A)

I changed the www Host (A) IP info to the new website host.
I added www for domain.com with our mail server's IP address - Not sure that I needed to do that
and added an Mail Exchange (MX) record for the www with domain.com and FQDN of the mail server as corp.domain.com / priority left at 10.

I am going to call guys from who I purchased the IP info about updating the PTR, but am completely uncertain about what I did in DNS on my DC.

Thank you.

 

by: endital1097Posted on 2009-08-12 at 06:49:18ID: 25078663

most likely your internal dc/dns is not the primary name server for your domain externally, so any changes you make on your dc will not improve your situation

how many external ip addresses do you have?

 

by: MezczyznaPosted on 2009-08-12 at 06:51:16ID: 25078682

for e-mail server 1

 

by: _jesper_Posted on 2009-08-12 at 07:25:30ID: 25079023

What are your real domain and IP addresses?  That will tell us where you need to go to update forward and inverse DNS.

 

by: StrifeJesterPosted on 2009-08-12 at 07:34:04ID: 25079110

Contact whoever the new supplier of your domain is and tell them they are missing ytour MX record.  Any respectable host should know what you are talking about and be able to resolve this.  If its godaddy then ask your marketing department for the login credentials for the domain so you can add the mx records yourself.

 

by: _jesper_Posted on 2009-08-12 at 07:49:41ID: 25079301

A PTR record refers to the resolution of the inverse zone data -> the IP address to host name.

In addition to configuring an MX record (specify a FQDN which has its own A record), contact whomever manages your address space DNS and have them configure an in-addr for the IP address so that it matches the forward FQDN.

 

by: MezczyznaPosted on 2009-08-12 at 07:53:07ID: 25079328

shred-tech.com

 

by: MezczyznaPosted on 2009-08-12 at 07:54:10ID: 25079342

e-mail 216.16.226.148

new host 67.212.94.66

 

by: MezczyznaPosted on 2009-08-12 at 07:58:14ID: 25079384

Seems I fixed it.
Thank you.

Can I get drunk now?

No. I am really not a drinker. :(

Time to look up shred-tech.com MX record Searching for shred-tech.com MX record at e.root-servers.net Timed out. Trying again. Searching for shred-tech.com MX record at a.root-servers.net Got referral to I.GTLD-SERVERS.NET. [took 42 ms] Searching for shred-tech.com MX record at I.GTLD-SERVERS.NET. Got referral to ns75.worldnic.com. [took 129 ms] Searching for shred-tech.com MX record at ns75.worldnic.com. Reports an answer. Record is:
DomainTypeClassTTLAnswershred-tech.com.MXIN7200corp.shred-tech.com. [Preference = 10]corp.shred-tech.com.AIN7200216.16.226.148 Looking up at ns75.worldnic.com.... Reports 1 MX record(s). 41ms. Looking up at ns76.worldnic.com.... Reports 1 MX record(s). 37ms. Average of all 2 nameservers: 39ms (plus 1591ms overhead). Score: A+ Note:  The 1591ms overhead is the time it takes to get your NS records from the parent servers, and indicates a worst-case scenario (normally, the resolving DNS server would have the common parent server entries cached, and would know the parent server(s) that were responding most quickly).
The best times since the last time this web server was last restarted are: 39ms average response, plus 59ms overhead.
Note that these times are from a server located in the United States; if most of the people using your DNS are outside of the United States, your actual results may be better than what is shown here.
A rating of 'B' or higher is generally good (this tool is very picky!).  This tool is designed to make an educated guess about speed, and to point out potential factors that may reduce the DNS speed, and it is not perfect.

 

by: MezczyznaPosted on 2009-08-12 at 07:59:36ID: 25079397

Now.

The Reverse DNS still failed.

I only fixed the MX record.

:(

 

by: _jesper_Posted on 2009-08-12 at 08:02:41ID: 25079434

Does this server host both incoming and outbound mail?

Does this server listen on more than one IP address?

I see an MX record for shred-tech.com
  -> corp.shred-tech.com

I see an A record for corp.shred-tech.com
  -> 216.16.226.148

I see a PTR record for 148.226.16.216.in-addr.arpa
  -> corp.shred-tech.com

What error information do you have indicating the inverse DNS failed?

 

by: MezczyznaPosted on 2009-08-12 at 08:04:47ID: 25079465

 

by: MezczyznaPosted on 2009-08-12 at 08:05:14ID: 25079470

dnsstuff says it works, though.

 

by: _jesper_Posted on 2009-08-12 at 08:05:47ID: 25079477

I missed your "new host" IP of 67.212.94.66

Is this the IP of your incoming (MX) server or your outgoing server or both?

Speedy Rails is responsible for the inverse DNS of this IP.

WorldNIC is responsible for the forward zone.

What changes have you made?

 

by: _jesper_Posted on 2009-08-12 at 08:07:23ID: 25079494

You need to put in the fully qualified domain name -> corp.shred-tech.com into mxtoolbox diagnostic.  When I do so, everything passes.

 

by: MezczyznaPosted on 2009-08-12 at 08:10:30ID: 25079534

I logged in to internic and seen that our MX record points to corp.domain.com not just domain.com

Then I deleted the (MX) record and created on on my DNS  and added Mail Exchanger (MX) record on my DNS server pointing to mailserver.corp.domain.com not just mailserver.domain.com

 

by: MezczyznaPosted on 2009-08-12 at 08:11:13ID: 25079543

O!

OK.

I guess it didn't click to my had.

 

by: MezczyznaPosted on 2009-08-12 at 08:13:03ID: 31614762

Thank you.

 

by: MezczyznaPosted on 2009-08-12 at 08:21:32ID: 25079644

head either

20120131-EE-VQP-002

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