🚀 go-pugleaf

[I am crossposting to comp.protocols.tcp-ip.domains]

In article <BvtG9B.GBo@breeze.rsre.mod.uk>,
heading%hermes.mod.uk@relay.mod.uk writes:
> I'd like, though, to have company.uk as my email address.

>  a) call the machine company.uk instead
>  b) have company.uk as an alias for foo.company.uk
>  c) register company.uk as a name with MX records
>       pointing to foo, then foo-backup, foo-reserve etc

(a) might be reasonable for a small site.  Even if you do this, I
    recommend using multiple MX records.
(b) is illegal.  If there are *any* DNS records for company.uk (and
    there will at least be SOA and NS records) then there may not be
    a CNAME record.
I recommend (c).
 
> Is there any disadvantage to the second approach, which seems
> on the face of it to be more flexible and more reliable?

Just that it is illegal (see above), less flexible and less reliable (in
that you can have several MX records pointing to several backup systems,
while you cannot have seevral CNAMEs pointing to several backup systems).

--apb
Alan Barrett, Dept. of Electronic Eng., Univ. of Natal, Durban, South Africa
RFC822: barrett@ee.und.ac.za                    Bang: m2xenix!undeed!barrett