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Hi All,
Might be a bit off topic for here, please suggest where else to go if
so.
Problem.
Customer sends hundreds of e-mails every day to locations all over the
world.
They have one or two people which they cannot get e-mail through to.
One in London and one in Taiwan.
These folks are saying that the domain name lookup that their mail
system is doing is not resolving out customers domain name and is
subsequently rejecting their message.
I've tried doing an nslookup on their domian name and sure enough
sometimes all I get is 'an unspecified error occurred'..
nslookup
domainname.co.uk
That said 90% of the time I do this I do get the correct response.
I've tried this from a number of different internet access points
connected through various ISP's and get the same thing.
Every now and again it fails..more often than not it works.
I've also been told that our customers ISP has not got their DNS setup
correctly.
They have also told me that when they query our customers MX record on
their ISP's primary nameserver, say ns0.isp.co.uk, they get a correct
response.
But when they run the same test against our customers ISP's secondary
listed nameserver they get a message saying that the domain cannot be
found.
Should both the ISP's listed nameservers for a domain respond in
exactly the same way to an MX lookup ?
I though that they should..
I've actually tested this with a number of other different customers
domains at several different ISP's and must say that the results that
I am getting are confusing me.
I'm trying:
nslookup
set vc
server ns0.isp.co.uk ( or ns2.isp.co.uk or whatever the secondary
listed nameserver is)
set type=mx
domainname.co.uk
Most of the time I'm finding that the domains respond OK on the ISP's
first listed nameservers and most of the time the domains are reported
as not found when I try do perform the same lookup against the
secondary listed nameserver..
Am I getting hold of the worng end of the stick here ?
We're considering moving our customer's domain hosting elsewhere..but
in light of what I finding I'm not entirely sure that I'm being
correctly informed.
Would it be a fair comment that all ISP's setup DNS in a myriad of
different ways ?
Anyone care to comment ?
Jim.
|
|
Change your ISP.
Yes, the record should always return the correct result. If the ISP isn't
responding and your client can't change the ISP provider, there is another
way to fix this. Make the DNS servers of your Registrar the authoritative
DNS servers and create the A record and MX record there. Don't forget your
PTR records. It might also be a good idea to create an SPF record as well.
--
Claus
<jdr.smith[ at ]virgin.net> wrote in message
news:1184175092.169046.20040[ at ]r34g2000hsd.googlegroups.com...
[Quoted Text] > Hi All,
>
> Might be a bit off topic for here, please suggest where else to go if
> so.
>
> Problem.
>
> Customer sends hundreds of e-mails every day to locations all over the
> world.
>
> They have one or two people which they cannot get e-mail through to.
> One in London and one in Taiwan.
>
> These folks are saying that the domain name lookup that their mail
> system is doing is not resolving out customers domain name and is
> subsequently rejecting their message.
>
> I've tried doing an nslookup on their domian name and sure enough
> sometimes all I get is 'an unspecified error occurred'..
>
> nslookup
> domainname.co.uk
>
> That said 90% of the time I do this I do get the correct response.
>
> I've tried this from a number of different internet access points
> connected through various ISP's and get the same thing.
>
> Every now and again it fails..more often than not it works.
>
> I've also been told that our customers ISP has not got their DNS setup
> correctly.
>
> They have also told me that when they query our customers MX record on
> their ISP's primary nameserver, say ns0.isp.co.uk, they get a correct
> response.
> But when they run the same test against our customers ISP's secondary
> listed nameserver they get a message saying that the domain cannot be
> found.
>
> Should both the ISP's listed nameservers for a domain respond in
> exactly the same way to an MX lookup ?
>
> I though that they should..
>
> I've actually tested this with a number of other different customers
> domains at several different ISP's and must say that the results that
> I am getting are confusing me.
>
> I'm trying:
>
> nslookup
> set vc
> server ns0.isp.co.uk ( or ns2.isp.co.uk or whatever the secondary
> listed nameserver is)
> set type=mx
> domainname.co.uk
>
>
> Most of the time I'm finding that the domains respond OK on the ISP's
> first listed nameservers and most of the time the domains are reported
> as not found when I try do perform the same lookup against the
> secondary listed nameserver..
>
> Am I getting hold of the worng end of the stick here ?
>
> We're considering moving our customer's domain hosting elsewhere..but
> in light of what I finding I'm not entirely sure that I'm being
> correctly informed.
>
> Would it be a fair comment that all ISP's setup DNS in a myriad of
> different ways ?
>
> Anyone care to comment ?
>
> Jim.
>
|
|
Hello Jim,
Thank you for posting here.
From the post, I understand one or two people in London and Taiwan cannot
get e-mail from your domain.
As your description, you can send email to many places except the two. At
same time, the MX record of the server cannot be resolved correctly every
time. Therefore, this is a reverse DNS lookup issue of your ISP.
Note: Many mail server will check the PTR record of the domain which email
come from. If the you do not have PTR record or the PTR record is not
match, the mail server will drop the email.
You should contact your ISP to create reverse DNS record and check the MX
record.
I hope the information above is helpful.
If there is anything else I can do for you, feel free to let me know.
Thanks and have a nice day!
Best regards,
Terence Liu(MSFT)
Microsoft CSS Online Newsgroup Support
Get Secure! - www.microsoft.com/security
=====================================================
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You can locate the newsgroup here:
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When opening a new thread via the web interface, we recommend you check the
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check http://support.microsoft.com for regional support phone numbers.
Any input or comments in this thread are highly appreciated.
=====================================================
This posting is provided "AS IS" with no warranties, and confers no rights.
--------------------
| From: jdr.smith[ at ]virgin.net
| Newsgroups: microsoft.public.windows.server.sbs
| Subject: Internet DNS name resolution
| Date: Wed, 11 Jul 2007 10:31:32 -0700
| Organization: http://groups.google.com
| Lines: 77
| Message-ID: <1184175092.169046.20040[ at ]r34g2000hsd.googlegroups.com>
| NNTP-Posting-Host: 82.3.76.150
| Mime-Version: 1.0
| Content-Type: text/plain; charset="iso-8859-1"
| X-Trace: posting.google.com 1184175092 12017 127.0.0.1 (11 Jul 2007
17:31:32 GMT)
| X-Complaints-To: groups-abuse[ at ]google.com
| NNTP-Posting-Date: Wed, 11 Jul 2007 17:31:32 +0000 (UTC)
| User-Agent: G2/1.0
| X-HTTP-UserAgent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0;
SLCC1; .NET CLR 2.0.50727; .NET CLR 3.0.04506;
InfoPath.2),gzip(gfe),gzip(gfe)
| Complaints-To: groups-abuse[ at ]google.com
| Injection-Info: r34g2000hsd.googlegroups.com; posting-host=82.3.76.150;
| posting-account=iXR8wgwAAADvhsNdgPAx9SBxO1f4Cd-I
| Path:
TK2MSFTNGHUB02.phx.gbl!TK2MSFTNGP01.phx.gbl!TK2MSFTFEEDS02.phx.gbl!news-out.
cwix.com!newsfeed.cwix.com!newscon02.news.prodigy.net!prodigy.net!news.glorb
.com!postnews.google.com!r34g2000hsd.googlegroups.com!not-for-mail
| Xref: TK2MSFTNGHUB02.phx.gbl microsoft.public.windows.server.sbs:49801
| X-Tomcat-NG: microsoft.public.windows.server.sbs
|
| Hi All,
|
| Might be a bit off topic for here, please suggest where else to go if
| so.
|
| Problem.
|
| Customer sends hundreds of e-mails every day to locations all over the
| world.
|
| They have one or two people which they cannot get e-mail through to.
| One in London and one in Taiwan.
|
| These folks are saying that the domain name lookup that their mail
| system is doing is not resolving out customers domain name and is
| subsequently rejecting their message.
|
| I've tried doing an nslookup on their domian name and sure enough
| sometimes all I get is 'an unspecified error occurred'..
|
| nslookup
| domainname.co.uk
|
| That said 90% of the time I do this I do get the correct response.
|
| I've tried this from a number of different internet access points
| connected through various ISP's and get the same thing.
|
| Every now and again it fails..more often than not it works.
|
| I've also been told that our customers ISP has not got their DNS setup
| correctly.
|
| They have also told me that when they query our customers MX record on
| their ISP's primary nameserver, say ns0.isp.co.uk, they get a correct
| response.
| But when they run the same test against our customers ISP's secondary
| listed nameserver they get a message saying that the domain cannot be
| found.
|
| Should both the ISP's listed nameservers for a domain respond in
| exactly the same way to an MX lookup ?
|
| I though that they should..
|
| I've actually tested this with a number of other different customers
| domains at several different ISP's and must say that the results that
| I am getting are confusing me.
|
| I'm trying:
|
| nslookup
| set vc
| server ns0.isp.co.uk ( or ns2.isp.co.uk or whatever the secondary
| listed nameserver is)
| set type=mx
| domainname.co.uk
|
|
| Most of the time I'm finding that the domains respond OK on the ISP's
| first listed nameservers and most of the time the domains are reported
| as not found when I try do perform the same lookup against the
| secondary listed nameserver..
|
| Am I getting hold of the worng end of the stick here ?
|
| We're considering moving our customer's domain hosting elsewhere..but
| in light of what I finding I'm not entirely sure that I'm being
| correctly informed.
|
| Would it be a fair comment that all ISP's setup DNS in a myriad of
| different ways ?
|
| Anyone care to comment ?
|
| Jim.
|
|
|
|
|