More on spamming..

Stephan Hermann <sh at nwu.de> wrote:
> At 02:43 01.10.97 +0200, Geert Jan de Groot wrote:
> >People may be interested to read http://maps.vix.com. It is my understanding
>
> I think, it's not a solution to build a frontier to the ISPs who are
> housing such spammers. We must stop those spammers with commercial ideas
> not with technical solutions such as filtering out IPs with as-path access
> lists.

Um, please read how the list works - it doesn't use as-path access list.
It sends /32 routes (normally) for specific hosts which orginate spam,
and transiently for specific relays currently being used to propogate
spam. Sure it's no defence, but every 3rd party (and, in one instance,
a customer - tut tut) who has been on this list and complained about
lack of connectivity to my network has since fixed their mail relay not
to forward spam (we take the feed). It's very effective at reducing
the amount of spam you get (at least for those zones which don't
have topologically distant backup MX).
 
> One (technical) idea can be, to install two smtp server:

All this does is stop you relaying. You can do this on one server
with the no relay patches on 
  http://www.sendmail.org/
if you can get the IP address stuff to work right, though we use
two servers for other reasons.


-- 
Alex Bligh
GX Networks (formerly Xara Networks)