RE: [Asrg] whitelisting server and not users

["Eric D. Williams" <eric@infobro.com>]

As any such methodology would seem easy to implement (but remember there is a 
scoping paradox if other measures are not taken (e.g. SMTP AUTH), that would 
tend to serve to elicit deployment to derive its benefits.  Since such a 
proposed method would not break existing deployments it would not appear to 
deter experimentation either.

-e

On Wednesday, April 02, 2003 2:25 PM, Steven F Siirila [SMTP:sfs@tc.umn.edu] 
wrote:
> On Wed, Apr 02, 2003 at 09:05:35PM +0200, Markus Stumpf wrote:
> > On Wed, Apr 02, 2003 at 07:34:34AM -0800, william@elan.net wrote:
> > > It does not because of multiple problems like breaking mailing lists and
> > > forwarders and roaming users, only looking for enevelope from (while most
> > >
> > > users see header from and it can still be forged, etc). Here are
> > > links about this (and similar) proposal that I gathered so far:
> >
> > Maybe I didn't make it clear in my first post in this thread, but sorry,
> > I can't
> > a) see the problems described above
> > b) see how the proposals in the list you provided do relate to my proposal
> >
> > What I am proposing is:
> >     mail.space.net	IN	A	195.30.0.8
> > we will like other mailservers to accept mail from mail.space.net and
> > indicate that by adding
> >     8.0.30.195.in-addr.arpa	IN	TXT	"abuse@space.net"
>
> Personally, I'd go a step further.  Associate an MTA connection with a
> domain name.  In other words, require rDNS and use the host name returned
> to look up a TXT record.  Using your above example, you'd have this:
>
> mail.space.net.			IN	A	195.30.0.8
> 				IN	TXT	"abuse@space.net"
> 8.0.30.195.in-addr.arpa.	IN	PTR	mail.space.net.
>
> For an MTA to be considered "valid" it must have both valid rDNS and a TXT 
RR.
>
>
> My only concern is how to get this in widespread use, which would be required
> before any severe penalty could be imposed on those that don't employ it.
> --
>
> Steven F. Siirila			Office: Lind Hall, Room 130B
> Internet Services			E-mail: sfs@umn.edu
> Office of Information Technology	Voice: (612) 626-0244
> University of Minnesota
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