RE: [Asrg] seeking comments on new RMX article

["Eric D. Williams" <eric@infobro.com>]

On Tuesday, May 06, 2003 10:03 AM, Vernon Schryver 
[SMTP:vjs@calcite.rhyolite.com] wrote:
> > ...
> > >Wouldn't be simpler to tell everyone to compare your sender domain name
> > >with your reverse DNS?
> >
> > rDNS does not support multiple domains.
> > with rDNS, if you have two vanity domains you need two IP addresses.
>
> That seems to be based on the mistaken notion that there can be only
> a single PTR RR per IP address.

There can only be one canonical reverse mapping for an IP address.  There can 
be multiple forward A records.  That is not to say the a PTR record can't be 
dynamically configured. However, yes that is the case for any instance for a 
transient or permenant assignment of a PTR RR AFAIK.

100	IN	PTR	domain1.com.
	IN	PTR	domain2.com.

does not work AFAIK, I will give it a shot.

-e
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