Re: Last Call: draft-klensin-rfc2821bis

Markku Savela wrote:
> 
> The goal should be to make IPv4 and IPv6 easily replaceable anywhere,
> whithout any reduced functionality.

I don't see how requiring MX lookups for IPv6 mail relaying reduces 
functionality.  As far as I can tell, it increases functionality because 
it provides (as a side effect) an easy, low-overhead way to say "this 
domain doesn't accept mail" in an IPv6 world.  Just don't list any MX or 
A records for it.

I guess the case that isn't being given much attention is the one where 
you have an IPv6 address assigned to a host, and you have a domain name 
associated with that address, and you want that host to be able to 
receive mail - but you don't have write permission for the DNS RRs for 
that domain, so you can't create MX records for it.  But to me the 
solution to that is easy - get your own domain name.

(IMHO the idea that some other party besides the one that runs a host 
should be able to make assertions in DNS about that host's domain name 
has always been fairly broken - we have ended up with a tussle between 
DNS administrators and host owners/administrators as a result.)

Keith
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