Extending SPF to IN-ADDR.ARPA space

> > | [MTAMark/SS type proposal deleted]
> What would this give them that they don't get from router filters
> already?
The ability to cost-shift the burden of filtering out spam from the
network providers that have the spammers to the receivers of the
spam.  (As you can probably tell, I'm not too hot on the idea of
MTAMark and/or SS.)


-wayne