[nzlug] Understanding email DNS

[Michael Adams]

I need a little help understanding how email DNS works.

At work we have web sites with a couple of different crowds. The
national ones are hosted with a web developer on e-Xpert accounts that
are mainly designed to be websites only. Our regional ones i have set up
with IServe through kiwiwebhost.co.nz running on LAMP servers.

The simple story is IServe will let me have add on domains as good as
gold. e-Xpert has the domains; foo.org.nz and eastcoast.foo.org.nz.

I was under the impression that the email for these domains had to
go through e-Xperts mailserver. Yet one of the other regions tells me
that their northern.foo.org.nz emails come direct to their server.

Either it is being forwarded through to this second server or there is
some other jiggery-pokery going on that i haven't heard of. Anyone want
to explain in laymans terms what might be going on here?

I couldn't get hold of the tech at the northern end to let him explain
it to me. He was on the road to Wellington.

-- 
Michael
 Those that can, do; those that can't, teach.