no reverse DNS entries for MX records

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David - 24 Jul 2003 08:26 GMT

I was running my domain through the http://www.dnsreport.com website
when i realised that I had one failed result in the MX field

"no reverse DNS entries for MX records"

Sorry for my newbie question, but where do I add the reverse mx records in
WinNT 4.0 Server DNS?

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JSalminen - 24 Jul 2003 14:19 GMT

You need to create an reverse lookup zone. Open DNS ADMIN and add a new
primary zone. The name of the zone will be the classful part of your network
(i.e. 192.168.1.x 255.255.255.0). You will actually reverse the octets in
this manner 1.168.192.in-addr.arpa (the .in-addr.arpa must follow the
octets).

When you have created the reverse lookup zone you should be able to open
each of your records in your primary zone and check the "Update associated
PTR record". That will create a record for you in the reverse lookup zone.

If you have more than one subnet you will have to create a reverse lookup
zone for each subnet (i.e. 192.168.1.x, 192.168.2.x 255.255.255.0)

> I was running my domain through the http://www.dnsreport.com website
> when i realised that I had one failed result in the MX field
[quoted text clipped - 3 lines]
> Sorry for my newbie question, but where do I add the reverse mx records in
> WinNT 4.0 Server DNS?

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Aref - 26 Jul 2003 12:06 GMT

But how can i do it in DNS server for nt4?

>-----Original Message-----
>You need to create an reverse lookup zone. Open DNS ADMIN and add a new
[quoted text clipped - 19 lines]
>
>.

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Jeff Cochran - 24 Jul 2003 21:33 GMT

>I was running my domain through the http://www.dnsreport.com website
>when i realised that I had one failed result in the MX field
[quoted text clipped - 3 lines]
>Sorry for my newbie question, but where do I add the reverse mx records in
>WinNT 4.0 Server DNS?

In the in-addr.arpa reverse domain for your network. You need a PTR
for the IP address of your mail system and the name of your mail
system defined in the MX record.

NT's DNS GUI has a bug in that if you don't create the reverse zone
before the forward zone it never gets updated when you add an A
record, even if you check the Update PTR Record box.

Jeff

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David - 25 Jul 2003 01:42 GMT

My primary and reverse lookup zone are already created.
I had check the PTR in the in-addr.arpa reverse domain, it is exactly as you
had stated, IP + name of my mail system.
Are they not registering? I had deleted the record and re-insert it back.
Restarted the DNS service.
Hope it helps.

> >I was running my domain through the http://www.dnsreport.com website
> >when i realised that I had one failed result in the MX field
[quoted text clipped - 13 lines]
>
> Jeff

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Jeff Cochran - 25 Jul 2003 15:53 GMT

Your MX isn't an alias is it? And the reverse points to the correct
MX record name? And there's no other PTR record for the same IP?

Though you know, my reverse points to a different host name than the
MX record now that I think of it. Hang on...

Yep. dnsreport.com passes my MX reverse entry even though the host
name is different from the MX host name. Maybe remove the PTR record
and recreate it?

Jeff

>My primary and reverse lookup zone are already created.
>I had check the PTR in the in-addr.arpa reverse domain, it is exactly as you
[quoted text clipped - 21 lines]
>>
>> Jeff

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David - 29 Jul 2003 01:52 GMT

Just realised that my host ISP DNS is looking for sub-domain (5th octets) of
my MX PTR record on my DNS server.
I just amended the PTR records via text, as NT4 doesn't allow it through the
GUI.
Now DNSstuff.com passes my reverse MX PTR but DNSreport.com still giving me
the same error.
Is it a norm to use 5th octets?

> Your MX isn't an alias is it? And the reverse points to the correct
> MX record name? And there's no other PTR record for the same IP?
[quoted text clipped - 33 lines]
> >>
> >> Jeff

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