Author: Peter Bowyer Date: To: Exim Users Mailing List Subject: 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.
