Re: [exim] Port Tests to Verify the Sending Hosts

On Mon, 7 Mar 2005 13:53:18 -0800 (PST), Jesse Geddis <exim@???> wrote:
> We did this at powweb.com fyi using postfix. i will try to dig up how we
> implemented it. At the time it seemed pretty weak and that never really
> changed imho. It seems to me it would be rather trival to make a spam
> client listen on a few ports on their workstation rendering this whole
> line of thinking useless pretty quickly.

It would, but the success of this kind of test relies on one thing -
there are not enough people implementing the test to hit the spammers'
or spamware authors' radar.

Marc's site (sorry, Marc!) is a tiny proportion of the spammer's
target. So the improved efficiency of Marc's spam blocking won't get
noticed. But if AOL started using it, it would.

An odd equation, isn't it?

Peter