[67269] in North American Network Operators' Group
RE: greylisting
daemon@ATHENA.MIT.EDU (Dmitri Krioukov)
Fri Feb 6 22:34:31 2004
From: "Dmitri Krioukov" <dima@krioukov.net>
To: "Suresh Ramasubramanian" <suresh@outblaze.com>
Cc: <nanog@merit.edu>
Date: Fri, 6 Feb 2004 22:33:21 -0500
In-Reply-To: <40245930.9040000@outblaze.com>
Errors-To: owner-nanog-outgoing@merit.edu
well, it might not scale only at the global scale :)
(while its current 'deployment' is far from being global
as far as i can see)
--
dima.
> -----Original Message-----
> From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of
> Suresh Ramasubramanian
> Sent: Friday, February 06, 2004 10:19 PM
> To: Ken Leland
> Cc: nanog@merit.edu
> Subject: Re: greylisting
>
>
>
> Ken Leland [2/7/2004 2:11 AM] :
>
> > On Fri, Feb 06, 2004 at 01:40:14PM -0500, Dmitri Krioukov wrote:
> >
> >>can someone provide any comments on greylisting?
> >>how effective is it, etc?
> >
> >
> > we have 20 regex expressions that block mail directly from a
> > reverse dns that "looks" like a consumer broadband connection.
> > Then we have to maintain a whitelist on a case by case basis.
>
>
> Er, I think you and Dmitri are talking about different things.
>
> From a mail operations standpoint, I am not a big fan of graylisting,
> because even legitimate senders get 4xx'd for a while, the first time
> they send mail.
>
> When any such strategy means that someone else's mail queues are filled
> with timed out emails waiting for retransmission, it d not be rocket
> science to see why this just doesn't scale too well.
>
> --
> srs (postmaster|suresh)@outblaze.com // gpg : EDEDEFB9
> manager, outblaze.com security and antispam operations
