[Techtalk] Spam solutions

[Kathryn Andersen]

On Sat, Aug 21, 2004 at 09:15:09AM -0600, Andrea Landaker wrote:
> Greylisting would work fine with whitelisting, as long as the 
> challenge-response is sent via valid SMTP.  Basically all greylisting does is 
> say "send that to me later".  Spammers give up because the programs they use 
> to send spam don't follow valid SMTP protocol.  Legitimate mail servers do 
> follow protocol, and when they retry the message, you let them through.  See 
> http://www.greylisting.org for more information.

This sounds great -- if you are running your own domain's mail server.
Alas, the rest of us that have to download mail from our ISP (using
fetchmail or getmail or something like that) I don't see how this can be
used at all. 8-(

Kathryn Andersen
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