On Tuesday, May 06, 2003 10:03 AM, Vernon Schryver
[SMTP:vjs(_at_)calcite(_dot_)rhyolite(_dot_)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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