Re: [exim] Antispam idea

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Author: Jeremy Harris
Date:  
To: exim-users @ exim. org
Subject: Re: [exim] Antispam idea
Renaud Allard wrote:
> Hello,
>
> I just stumbled into a small idea for preventing spambots. As it seems
> many spambots like to connect multiple time from the same IP at the same
> time to the server. Each instance for only one mail delivery. This
> implies the server is busy checking all the inputs from this very same
> IP.


As others have said, not quite enough. Correlating with mutating-HELO
is currently a good tactic though. I'm doing this, triggered by
a helo-verify fail. Unfortunately, false-positives still include
EBay and Amazon.

- Jeremy