CNAME & MX record confusion.

[Stephane Bortzmeyer]

On Mon, Mar 03, 2008 at 09:08:24AM -0800,
 Chris Buxton <cbuxton at menandmice.com> wrote 
 a message of 60 lines which said:

> what exactly do you mean by "MX records... are an exception"?

All Resource Record types are used for several protocols (for
instance, A records are used by HTTP but not only. that's one of the
reasons why wildcards in a zone like ".com" are bad: they break
non-HTTP protocols.)

MX are an exception: they are tied to a specific service, email, so
you can do tricks with them (wildcards, again) which are
application-specific, without fearing you'll break something else.

[And MX should be deprecated, we should use SRV for everything, but it
is another matter.]