[170345] in North American Network Operators' Group
Re: misunderstanding scale, SMTP edition
daemon@ATHENA.MIT.EDU (Tony Finch)
Wed Mar 26 13:50:16 2014
Date: Wed, 26 Mar 2014 17:36:38 +0000
From: Tony Finch <dot@dotat.at>
To: John Levine <johnl@iecc.com>
In-Reply-To: <20140326170906.13315.qmail@joyce.lan>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
John Levine <johnl@iecc.com> wrote:
>
> If I were a spammer or an ESP who wanted to listwash, I could easily use
> a different IP addres for every single message I sent.
Until mail servers start rate-limiting the number of different addresses
that are used :-) You can do something like the following in Exim, which
limits IPv6 senders to 16 addresses per /64 per day.
defer
hosts = <; 2000::/4
ratelimit = 16 / 1d / per_conn /\
unique=$sender_host_address /\
${mask:$sender_host_address/64}
Tony.
--
f.anthony.n.finch <dot@dotat.at> http://dotat.at/
Shannon, Rockall: Southerly 5 or 6 at first in west, otherwise variable 3 or
4, becoming northeasterly 4 or 5. Moderate or rough. Showers. Good,
occasionally moderate.
