[Greylist-users] Greylisting with automatic IP address based whitelist

[Douglas Hardison]

Akihiro KAYAMA wrote:

> Hi all.
> 
> I have a fundamental question About Greylisting. This is not explained
> in Greylisting whitepaper. I want to know any URLs if already
> discussed.
> 
> My question is the reason why Greylisting does not use automatic IP
> address based whitelist.
> 
> When a particular site has been successfully probed by triplet, it is
> reasonable to consider the site to be driven by legitimate MTA. So if
> the site deliver subsequent mails with different sender/recipient, as
> long as IP address is the same, next probe should be the same result.
> In this point, Greylisting with IP address based whitelist will
> accomplish the same result, and significantly reduce delayed mails.
> 
> ISP's dynamic IP addresses is not a problem because there is few
> servers on such addresses, clash with open proxy host is still rare.
> 
> Anyway, I have modified my greylisting script to do so and happily
> enjoy greylisting power without special care about Ezmlm. I can't see
> any evidence that same IP address host occasionally runs both
> legitimate MTA and open proxy. 
> 
> Any comments will be appreciated. 
> Thanks.
> 
> -- kayama
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Greylist-users mailing list
> Greylist-users at lists.puremagic.com
> http://lists.puremagic.com/cgi-bin/mailman/listinfo/greylist-users

Would you care to share your modifications? I'd be interested in
trying them out.

dhardison