On Saturday 02 April 2005 05:32 pm, karl@xxxxxxxxxxxxxxxxxxxxxx wrote:
> How
> would I go about providing a good, solid *matching* ptr (as in, mail
> from AcmeWidget.com reflects to mail.AcmeWidget.com at x.x.x.219 ...
> which also happens to be mail.hostco.com) for the bazillion and one
> virtual-hosted email accounts on mail.hostco.com?
You wouldn't. That's not and never was the purpose of a ptr record.
The ptr record is to attach responsibility for the IP#. That's done by
pointing it to the hostname.
You could have multiple ptr records, but there exists no facility in any
DNS or resolution system to match up ptr records with a records. If I
recall correctly, behavior in the case of multiple ptr records is
undefined.
Jeff
--
Jeff Lasman, nobaloney.net, P. O. Box 52672, Riverside, CA 92517 US
Professional Internet Services & Support / Consulting / Colocation
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Phone +1 951 324-9706, or see: "http://www.nobaloney.net/contactus.html";
