mail filtering based on reverse DNS

[Sander Steffann]

Hi,

> Certainly I and others have thought of writing our own auto-PTR
> response generator for delegated reverse zones.  I see now that the
> success of a PTR-verification scheme depends on ISPs *not* doing this
> for every J. Random Customer.

The more I think about it, the more I feel that auto-generating PTR records is not a wise thing to do. This is one example, filling the caches of DNS resolvers is another. Would it be a good idea to write a BCP on this subject?

- Sander