Will MX lookup ignore MX on server which also has NS delegation.

Barry Margolin barmar at alum.mit.edu
Thu May 29 22:43:38 UTC 2008

In article <g1mkh0$tro$1 at sf1.isc.org>,
 "Greg Chavez" <greg.chavez at gmail.com> wrote:

> On Thu, May 29, 2008 at 11:52 AM, Robin Farrell <robinfarrell at gmail.com> 
> wrote:
> > We have a client that is using NS to delegate their DNS to us and we will
> > host their MX records.
> > They are refusing to remove legacy MX and A records for the domain in
> > question from their DNS, yet they have the correct NS records in place for
> > the domain in question to be redirected to us.
> > Could this possibly effect how dns MX/A lookups are redirected to our
> > servers?
> They're *refusing*?  Well, that's peculiar behavior.  But it shouldn't
> matter.  You can't partially delegate a domain to another authority.
> It's all or nothing.  What happens when you query their server for the
> NS records of the delegated domain?  I submit that the delegation is
> not in place as you describe.

If they're running BIND it should ignore the MX and A records in the 
parent zone because of the delegation.  But I believe there are other 
DNS implementations that do not do this.

Barry Margolin, barmar at alum.mit.edu
Arlington, MA
*** PLEASE don't copy me on replies, I'll read them in the group ***

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