Re: [exim] delaying inbound messages

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Autore: Todd Lyons
Data:  
To: Jeff Lasman
CC: Exim Users List
Oggetto: Re: [exim] delaying inbound messages
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

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