Spammers Relaying Through Bounces

[dsr at tao.merseine.nu (dsr at tao.merseine.nu)]

On Mon, Sep 27, 2004 at 02:32:50PM -0400, Kent Borg wrote:
> I got a bounce from AOL including the URL
> <http://postmaster.info.aol.com/errors/554rlybd.html>.
> 
> It seems they consider me a relayer of spam, and I think I know why:
> spammers send e-mail from "Person X", to "Bogus Person Y" at my
> domain, "Bogus Person Y" doesn't exist, so qmail bounces the message
> back to "Person X".  They then do this for a lot of different persons
> as "Person X", and turn me into a spam house.
> 
> How can I stop this relaying?

if you're using qmail, as root:
  echo doublebounce > /var/qmail/control/doublebounceto:
  echo # > /var/qmail/alias/.qmail-doublebounce

and, (I think), if you're using postfix, in main.cf:
  notify_classes = resource, software, bounce, 2bounce

-dsr-