[67332] in North American Network Operators' Group
Re: question on ptr rr
daemon@ATHENA.MIT.EDU (Paul Vixie)
Sun Feb 8 15:29:55 2004
To: nanog@merit.edu
From: Paul Vixie <vixie@vix.com>
Date: 08 Feb 2004 20:29:17 +0000
In-Reply-To: <Pine.GSO.4.58.0402072016050.24446@clifden.donelan.com>
Errors-To: owner-nanog-outgoing@merit.edu
sean@donelan.com (Sean Donelan) writes:
> A Google search turned up http://www.unixwiz.net/techtips/pacbell-rdns.html
>
> But wouldn't this defeat the very behavior you are depending on to
> block mail? If every network administrator had reverse DNS for every
> IP address, your check for systems lacking rDNS wouldn't work.
that's one check of many. the PTR has to match the HELO, which means all
of the worms and spammers who forge @yahoo.com addresses and use YAHOO.COM
as their HELO will continue to get hammered.
> Or do we actually want a Fortune 1000 network. Direct communications
> are prohibited between most users. If you are not a Fortune 1000 network,
> you must forward your email through an approved provider which will check
> the mail for unauthorized content.
yes, actually, that's what we're headed for.
> Suppose AOL, MNN, Yahoo, etc agree to accept mail from each other and not
> from other people. This is pretty much how the world worked from
> 1980-1990. CompuServe, MCIMail, The Source, Delphi, etc.
fine by me. the people i want to exchange mail with aren't AOL users anyway.
--
Paul Vixie
