Re: SPF is not usable as legal measure against spammers.

On Fri, Jul 16, 2004 at 08:26:06AM -0600, 
administrator(_at_)yellowhead(_dot_)com wrote:
> At 06:33 AM 7/16/2004 -0400, Stuart D. Gathman <stuart(_at_)bmsi(_dot_)com> 
> wrote:
> > SPF, for one, demands that PTR's match the A record.  For that matter,
> > every internet application I've ever used ignores PTR records that do
> > not match any A record for the name.  Perhaps you known of some (made by
> > Microsoft?), but it is irrelevant since SPF specifically requires that PTR
> > records match with an A record for the name.
> ***************** REPLY SEPARATER ******************
> That's interesting, because it is a very common practice these days to
> service many domains from one IP address (we currently service 10 virtual
> email domains from one server). You can publish multiple PTR records, but
> unfortunately there are many programs out there that only look at the first
> one. Reliably matching up the PTR to the "A" record is virtually impossible.
This is no problem i think, if you do a PTR lookup for the ip, take the first
resonse and do an A lookup on that, you still get the original ip back,
don't you? So no problem there. If you do get another IP, something is
wrong with the dns setup, right?

Koen

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