Hi, I’m having problems sending email to anyone @ukaea.org.uk due to a dns
issue with one of our 2000 servers. When I perform and nslookup on
mail.ukaea.org.uk on the server it resolves to 194.128.63.76 but when I ran a
DNS lookup for ukaea.org.uk using one of many internet lookups it come back
with the below results:

Searching for ukaea.org.uk MX record at j.root-servers.net [192.58.128.30]:
Got referral to NS2.NIC.uk. [took 229 ms]
Searching for ukaea.org.uk MX record at NS2.NIC.uk. [217.79.164.131]: Got
referral to ns1-u.dns.pipex.net. [took 76 ms]
Searching for ukaea.org.uk MX record at ns1-u.dns.pipex.net.
[158.43.193.85]: Reports cluster-e.mailcontrol.com. [took 75 ms]

Answer:


Domain Type Class TTL Answer
ukaea.org.uk. MX IN 86400 cluster-e.mailcontrol.com. [Preference = 5]
ukaea.org.uk. MX IN 86400 cluster-j.mailcontrol.com. [Preference = 5]
ukaea.org.uk. NS IN 86400 ns0-u.dns.pipex.net.
ukaea.org.uk. NS IN 86400 ns1-u.dns.pipex.net.
ns1-u.dns.pipex.net. A IN 86400 158.43.193.85


As you can see the current MX look up for ukaea.org.uk is completely
different to that which is stored in the cached DNS on the server. I’ve
cleared the cache on the server using clear cache option and I’ve also
flushed the cache on the server from the command prompt. I even restarted the
server but it continually resolves to the wrong address.

I and utilising Secure cache against pollution and forwarders any on
resolving this would be appreciated.

Thanks!

Monkey1888 wrote:
> Hi, I'm having problems sending email to anyone @ukaea.org.uk due to
> a dns issue with one of our 2000 servers. When I perform and nslookup
> on mail.ukaea.org.uk on the server it resolves to 194.128.63.76 but
> when I ran a DNS lookup for ukaea.org.uk using one of many internet
> lookups it come back with the below results:
>
> Searching for ukaea.org.uk MX record at j.root-servers.net
> [192.58.128.30]: Got referral to NS2.NIC.uk. [took 229 ms]
> Searching for ukaea.org.uk MX record at NS2.NIC.uk. [217.79.164.131]:
> Got referral to ns1-u.dns.pipex.net. [took 76 ms]
> Searching for ukaea.org.uk MX record at ns1-u.dns.pipex.net.
> [158.43.193.85]: Reports cluster-e.mailcontrol.com. [took 75 ms]
>
> Answer:
>
>
> Domain Type Class TTL Answer
> ukaea.org.uk. MX IN 86400 cluster-e.mailcontrol.com. [Preference = 5]
> ukaea.org.uk. MX IN 86400 cluster-j.mailcontrol.com. [Preference = 5]
> ukaea.org.uk. NS IN 86400 ns0-u.dns.pipex.net.
> ukaea.org.uk. NS IN 86400 ns1-u.dns.pipex.net.
> ns1-u.dns.pipex.net. A IN 86400 158.43.193.85
>
>
> As you can see the current MX look up for ukaea.org.uk is completely
> different to that which is stored in the cached DNS on the server.
> I've cleared the cache on the server using clear cache option and
> I've also flushed the cache on the server from the command prompt. I
> even restarted the server but it continually resolves to the wrong
> address.

This is because the MX record does not give the mail servers name as
mail.ukaea.org.uk, which is not an uncommon configuration as long as those
mail server accept mail for your domain. Even though you have an A record
for mail.ukaea.org.uk does not automatically make it your MX server.
If you want your mail to go to mail.ukaea.org.uk, you need to create an MX
record that gives that name. If you are receiving you e-mail then I would
suspect the servers relay to your mail server or use store and forward.


--
Best regards,
Kevin D. Goodknecht Sr. [MVP]
Hope This s
===================================
When responding to posts, please "Reply to Group"
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me remove the nospam. from my email address.
===================================
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https://secure.lsaol.com/
===================================
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It will strip signature out and more
http://home.in.tum.de/~jain/software/oe-quotefix/
===================================
Keep a back up of your OE settings and folders
with OEBackup:
http://www.oe.com/OEBackup/Default.aspx
===================================

Thanks Kevin!

Simple solution was to remove the cached entry for mail.ukaea.org.uk. After
removing this entry this time I didn’t perform a lookup for mail.ukaea.org.uk
so no cache DNS was created for mail.ukaea.org.uk and therefore didn’t
resolve to 192.58.128.30. I send a test message to someone@ukaea.org.uk and
the DNS cache entry for ukaea.org.uk was created and now resolves to
cluster-j.mailcontrol.com. We can now send email to the orginisation

Thanks!


"Kevin D. Goodknecht Sr. [MVP]" wrote:

> Monkey1888 wrote:
> > Hi, I'm having problems sending email to anyone @ukaea.org.uk due to
> > a dns issue with one of our 2000 servers. When I perform and nslookup
> > on mail.ukaea.org.uk on the server it resolves to 194.128.63.76 but
> > when I ran a DNS lookup for ukaea.org.uk using one of many internet
> > lookups it come back with the below results:
> >
> > Searching for ukaea.org.uk MX record at j.root-servers.net
> > [192.58.128.30]: Got referral to NS2.NIC.uk. [took 229 ms]
> > Searching for ukaea.org.uk MX record at NS2.NIC.uk. [217.79.164.131]:
> > Got referral to ns1-u.dns.pipex.net. [took 76 ms]
> > Searching for ukaea.org.uk MX record at ns1-u.dns.pipex.net.
> > [158.43.193.85]: Reports cluster-e.mailcontrol.com. [took 75 ms]
> >
> > Answer:
> >
> >
> > Domain Type Class TTL Answer
> > ukaea.org.uk. MX IN 86400 cluster-e.mailcontrol.com. [Preference = 5]
> > ukaea.org.uk. MX IN 86400 cluster-j.mailcontrol.com. [Preference = 5]
> > ukaea.org.uk. NS IN 86400 ns0-u.dns.pipex.net.
> > ukaea.org.uk. NS IN 86400 ns1-u.dns.pipex.net.
> > ns1-u.dns.pipex.net. A IN 86400 158.43.193.85
> >
> >
> > As you can see the current MX look up for ukaea.org.uk is completely
> > different to that which is stored in the cached DNS on the server.
> > I've cleared the cache on the server using clear cache option and
> > I've also flushed the cache on the server from the command prompt. I
> > even restarted the server but it continually resolves to the wrong
> > address.
>
> This is because the MX record does not give the mail servers name as
> mail.ukaea.org.uk, which is not an uncommon configuration as long as those
> mail server accept mail for your domain. Even though you have an A record
> for mail.ukaea.org.uk does not automatically make it your MX server.
> If you want your mail to go to mail.ukaea.org.uk, you need to create an MX
> record that gives that name. If you are receiving you e-mail then I would
> suspect the servers relay to your mail server or use store and forward.
>
>
> --
> Best regards,
> Kevin D. Goodknecht Sr. [MVP]
> Hope This s
> ===================================
> When responding to posts, please "Reply to Group"
> via your newsreader so that others may learn and
> benefit from your issue, to respond directly to
> me remove the nospam. from my email address.
> ===================================
> http://www.lonestaramerica.com/
> http://support.wftx.us/
> https://secure.lsaol.com/
> ===================================
> Use Outlook Express?... Get OE_Quotefix:
> It will strip signature out and more
> http://home.in.tum.de/~jain/software/oe-quotefix/
> ===================================
> Keep a back up of your OE settings and folders
> with OEBackup:
> http://www.oe.com/OEBackup/Default.aspx
> ===================================
>
>
>