On Thu, Sep 1, 2011 at 11:05 AM, Jeff Lasman <blists@???> wrote:
> One
> of our users has suggested we delay all inbound messages on port 25 by three
> seconds to help eliminate spam. My thought is that if we're delaying busy
> legitimate servers on each delivery, we're not being good neighbors.
> He's suggesting this:
> # Accept hosts who are polite enough to wait rather than just send, as spammers do
> accept hosts = *
> delay = 3s
My only comment is that 3 seconds is not a very long time.
> # Deny hosts who don't wait
> Is there a community concensus on whether or no this is reasonable?
I don't know if it's a concensus, but I do know that a LOT of botnet
machines don't wait. Your suggested config is pretty close to the way
I do it, here's my exact config:
acl_check_connect:
warn !hosts = +relay_from_hosts
condition = ${if eq{$interface_port}{25}{1}{0} }
delay = 10s
accept message = $primary_hostname, ESMTP Exim
$version_number, $tod_full\nRFC's enforced
...Todd
--
If Americans could eliminate sugary beverages, potatoes, white bread,
pasta, white rice and sugary snacks, we would wipe out almost all the
problems we have with weight and diabetes and other metabolic
diseases. -- Dr. Walter Willett, Harvard School of Public Health
