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(_at_)tc(_dot_)umn(_dot_)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(_at_)elan(_dot_)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(_at_)space(_dot_)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(_at_)space(_dot_)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(_at_)umn(_dot_)edu
Office of Information Technology Voice: (612) 626-0244
University of Minnesota
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