🚀 go-pugleaf

In article <75@dynasys.UUCP> jessea@dynasys.UUCP (Jesse W. Asher) writes:
> Question:  Why in the world would I want to have mail sent to another
> site just so that site could send it to me?  If, for example, my domain
> is "dynasys.com", what is the advantage of having my mail sent to the
> entity that takes care of the "com" domain only to then be sent to me?

	One common confusion (and I admit, I was confused by this myself)
is that domain names, IP addresses, and mail paths are all, at least in the
general sense, orthagonal concepts.  There is no reason why, just because
you are a top-level .com domain that the .com nameserver has to have
anything to do with your mail other than handing out your nameserver
resource records (RRs) to anybody who asks for them.

	Imagine the following.  I've got a bunch of machines with names of
xx.phri.nyu.edu.  They all happen to be on the same ethernet, with IP
addresses of 128.122.136.xx, but that doesn't mean anything.  In fact,
there is a machine on my ethernet with a 128.122.136.xx which isn't in the
phri.nyu.edu domain.  Now, let's say I set up a machine at home.  It's
owned by phri, and used for phri business, so we decide it should have a
phri name.  We call it foo.phri.nyu.edu.  It's not on the Internet, but
does have a uucp link to phrivax.phri.nyu.edu.  We just have to install an
MX record saying that phrivax.phri.nyu.edu is where you should send mail
for foo.phri.nyu.edu.  Now, lets say that the phone call involved in that
would be long distance and I'd rather not pay those bills, and there just
happens to be a site on the Internet, say bozo.com, down the street from me
that is willing to set up a uucp link to me and be my mail exchanger.
Fine, we take out the MX record described earlier and put in one saying
that bozo.com is now the mail exchanger for foo.phri.nyu.edu.

--
Roy Smith, Public Health Research Institute
455 First Avenue, New York, NY 10016
roy@alanine.phri.nyu.edu -OR- {att,philabs,cmcl2,rutgers,hombre}!phri!roy
"My karma ran over my dogma"