DNS recommendations - the paper

randy at psg.com (Randy Bush) wrote:

> >>> 	@ IN SOA ns.isp.net. netmaster.isp.net.
> >>> 	         ( 1998100100 86400 3600 604800 345600 )
> >> s/netmaster/hostmaster/   see RFC 2142
> >> or, i think it was piet who recommended being conservative, and do not
> >> relying on aliases, rather use a real mailbox name.
> > So that person can safely go on a two-week holiday?
> > I'd rather put in a real hostname and not rely on MX records

Well, the point is, here the domain name points to the mail machine ;-)
Does everybody agree that we should recommend an A-RR'd record here?

> > (Remember that sendmail falls back to A records if it can't find any MX
> >  records for a host.)
> 
> i think of it the other way, but with the same result.  mail will be sent
> to the (address in rdata of the) A RR unless some one put in an MX RR
> because the (interface denoted in the) A RR can not accept mail.

Let's put it this way: If MX records are found, mailers try to deliver
there. If not, A records are used. So whichever way you put it, if
MX records are existent, they will get in your way ;-)

Elmi.