Re: [anti-spam-wg] About DNSBLs vs greylisting - Was: Steve Linford and Spamhaus Internet Terrorists
From: Esa Laitinen <esa.laitinen@localhost
Date: Wed, 23 Aug 2006 09:24:14 +0200
On Tue, Aug 22, 2006 at 12:35:42PM +0200, pna.lists wrote:
> Even those incompatible servers (GroupWise) are able to understand 4xx
> messages -- the current versions are fixed.
Yeah. But do everybody run the current versions?
> >Or people configuring their mailservers to try delivery just once, or
> >mailing-list services than do not use to keep queues for performance
> Are lame senders' administrators an excuse???
These are no excuses, but realities. The mail needs to get
delivered. If there are lame administrators, we have to take that
And it is easy for an outsider to say somebody is a lame
administrator. It is one thing to run a mail server with a few
thousand users, and quite another to run a server hosting mailing
lists that deliver hundreds of thousands, if not millions messages a
A system I use does a resend generally 12-24 hours after the first
delivery try for performance reasons. This quite often trows off the
greylisting. Which admin is lame, the one that uses greylisting, or
the one that has config which delays the retry? IMHO the greylister.
> You can use /24 address range instead of a single IP address in your
> greylisting triplets and/or you can store sender domain instead the
> sender e-mail address (from the SMTP envelope).
But the retry doesn't necessarily come even from the same ISP!
PGP Fingerprint: 10B0 3BA8 730A 070B 19F3 9E02 3975 9382 F861 C1B3
Public key at: http://iki.fi/laitinen/pubkey.html
YIM: reunaesa ICQ: 160631289 AIM: punkkinen MSN: esahi5@localhost
Description: PGP signature