Shane Kerr wrote:
> ...
>
> However, as far as I can tell everyone insisting that PTR is important
> is arguing that the world would be a better place if every endpoint on
> the Internet was equal.
if by "equal" you mean "so expensive that it won't be an open relay,
won't get infected with relaying malware, will be monitored, will be
upgraded, and its owner will accept complaints about it" then yes i'd
argue that the world would be a better place if every endpoint on the
internet was "equal".
however, it ain't so, and ain't ever gonna be so. most devices are
cheap, mobile, proprietary shankware. IoT is going to accelerate that
trend unimaginably (unless you have an exquisitely dark imagination.)
so, given that endpoints aren't equal, and that by sheer mass of
numbers, most endpoints are dangerous to themselves and others, i'd like
some method by which i, as an SMTP responder, can tell the difference.
lack of PTR, and machine-generated PTR, are pretty good telltales, just
expensive in the case of machine-generated. any rules change should
either make that situation better, or at minimum, not make it worse.
but i think i'm offering a minor summary-correction, in that i'm not
arguing for endpoint equality. rather, i'm arguing that in the proved
absence of such equality, we have other steps we MUST take as receivers.
("be liberal in what you accept" stopped being a good idea in 1995 or so
when commercialization/privatization took hold.)
--
Paul Vixie
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