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