Re: incorrect spam setups cause spool messes on forwarders

[Jared Mauch <jared () puck nether net>]

On Mon, Dec 01, 2003 at 10:50:51AM -0800, Randy Bush wrote:
> > > is the following a general problem, or just one i am seeing?
> >
> > Verizon does SMTP callbacks, connecting back to the MX of the envelope 
> > sender and trying to verify that the user exists
> >
> > > 2003-12-01 10:09:05 1APbBa-000Ork-DY == foo.user () verizon net <foo () psg com> R=lookuphost T=remote_smtp defer 
> > > (0): SMTP error from remote mailer after MAIL FROM:<nikkiadamczyk () gerbangmail com> SIZE=5365: host 
> > > relay.verizon.net [206.46.170.12]: 450 Requested mail action not taken-Try later:sc004pub.verizon.net
> >
> > So this would connect to the MX of gerbangmail.com and try to verify 
> > that whatever () gerbangmail com exists.
> >
> > gerbangmail.com.        5h55m6s IN MX   0 sitemail.everyone.net.
> >
> > If the MX (sitemail.everyone.net) doesn't respond fast enough for 
> > verizon, their tester times out, and the message gets 4xx'd.
>
> interesting but utterly irrelevant.  the question was not how
> verison decided it was spam.  the point was that their server
> returned a 450 as opposed to a 5xx (550 looks good), and this
> causes net damage.

        I think he's saying that they were unable to perform
the validation hence the 450.  If the validation was successful,
they'd return a 200 series code, if it was unsuccessful, they
would return a 500 series code.

        - jared

-- 
Jared Mauch  | pgp key available via finger from jared () puck nether net
clue++;      | http://puck.nether.net/~jared/  My statements are only mine.