Dmitry Samersoff <[email protected]> (Sa 27 Jun 2009 19:00:13 CEST):
...
> 
> Much more often problem is clusters: lots of SMTP clusters can resend 
> e-mail from another IP address. Fortunately most of them is not 
> spammers.  I think a) the problem should be mentioned in this chapter b) 
> it's better to whitelist such clusters rather then exclude sender IP 
> from hash calculation.

I'm greylisting on '$sender_address|$local_p...@$domain'. It works with
cluster based senders (web.de, I think).

It's perl based as exim "plugin", but limited to a single host.

    http://www.schlittermann.de/doc/grey.shtml

    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann
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