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Re: Hurting email spammers with iptables

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On Fri, 16 May 2014 19:47:37 +0000, S.K.R. de Jong wrote:

> I run a small email server in which (of course) I get a certain amount
> of spam. I know exactly what IP addresses the spam is coming from,
> so keeping it at bay is easy. However, I'd like to do more than that.
> 
> 	Would it be possible, with iptables, so arrange things on my side
> so that resources are potentially indefinitely consumed at the system
> with the IP address from which the spam is being sent?
> 
> 	For instance, since the connection to port 25 is a TCP
> connection, would it be possible to force them to keep that connection
> open for several minutes, before telling them that their spam has been
> rejected?

	A followup on this, in case anyone might be interested:

	I took a different approach to dealing with the spam issue; if I 
can't hurt them, at least I can keep (most of) them at bay. I am now 
using lists of IP addresses/countries in sendmail, and by blocking 
connections from the following countries:

	bd, cn, do, hk, id, il, in, ir, om, ro, ru, sa, sg, th, tw, vn, za

my incoming spam has dropped almost to nothing. 

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Hurting email spammers with iptables "S.K.R. de Jong" <SKRdJ@nowhere.net> - 2014-05-16 19:47 +0000
  Re: Hurting email spammers with iptables Bit Twister <BitTwister@mouse-potato.com> - 2014-05-17 00:31 +0000
    Re: Hurting email spammers with iptables "S.K.R. de Jong" <SKRdJ@nowhere.net> - 2014-05-17 16:03 +0000
      Re: Hurting email spammers with iptables Bit Twister <BitTwister@mouse-potato.com> - 2014-05-17 16:18 +0000
        Re: Hurting email spammers with iptables "S.K.R. de Jong" <SKRdJ@nowhere.net> - 2014-05-18 02:53 +0000
          Re: Hurting email spammers with iptables Doug Laidlaw <laidlaws@hotkey.net.au> - 2014-05-23 04:09 +1000
            Re: Hurting email spammers with iptables "S.K.R. de Jong" <SKRdJ@nowhere.net> - 2014-05-23 14:12 +0000
              Re: Hurting email spammers with iptables Richard Kettlewell <rjk@greenend.org.uk> - 2014-05-23 16:30 +0100
  Re: Hurting email spammers with iptables detha <detha@foad.co.za> - 2014-05-18 09:22 +0200
    Re: Hurting email spammers with iptables "S.K.R. de Jong" <SKRdJ@nowhere.net> - 2014-05-18 14:26 +0000
      Re: Hurting email spammers with iptables buck <buck@private.mil> - 2014-05-18 18:27 +0000
  Re: Hurting email spammers with iptables "S.K.R. de Jong" <SKRdJ@nowhere.net> - 2014-08-11 17:20 +0000

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