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
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