> If you replace "DNS RBL check" with some other check, then the program 
> you're talking about is the linux kernel. This subject has been 
> discussed last April under the subject "Zombies blocking my smtp". See 
> e.g. 
>
http://www.mail-archive.com/[email protected]/msg33586.html
> 
> I've thought of a better way than calling iptables for each address, 
> but haven't yet managed to find that couple of afternoons for writing 
> it, since then :-(

thx for the link. I implemented something similar this:

http://robert.penz.name/smtpiptablesblocker/

but I think instead of my script it would be really cool if courier would
have something like this integrated. It would be really easy to implement.
The courier smtp process sends a 511 error messages, adds the IP address of
the spammer to ipt_recent and terminates. The proof of concept is down with
my script.

Take also a look at the links in the beginning of the text, as they show
how I came to this solution and what I tried before and didn't work. 

-- 
Regards,
Robert
-----
Robert Penz

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