iptables question

Gregory Nowak greg at romuald.net.eu.org
Sun Jul 4 13:20:35 EDT 2004


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Your guess is correct. I can direct my MTA to use a smarthost, but I
can't do that with other software, such as serialmail for example. I
also like the fact that I get somewhere when I connect on port 25,
rather then just getting nothing, since my ISP blocks out-bound
smtp. Yes, this is cosmetic in nature, but I like it nevertheless.

Greg


On Sun, Jul 04, 2004 at 10:06:45AM -0500, Thomas Stivers wrote:
> on Sun, Jul 04, 2004 at 09:30:03AM -0500, Gregory Nowak wrote:
> > iptables -t nat -A OUTPUT -p tcp -o eth0 --dport 25 -j DNAT
> > --to-destination  aaa.bbb.ccc.ddd-eee.fff.ggg.hhh
> > 
> > (watch the line wrapping if you use this), and it works
> > flawlessly. Thanks to all those who helped and offered suggestions.
> 
> And now my big question, what are you hoping to achiev with this, or I
> should say what have you achieved. My gues is to trick your MTA to send
> all your mail through an isp's smtp server without your MTA knowing
> about it, but this is just a guess.
> 
> -- 
> "Debugging is twice as hard as writing the code in the first place.
> Therefore, if you write the code as cleverly as possible, you are,
> by definition, not smart enough to debug it." - Brian W. Kernighan
> 
> Thomas Stivers	e-mail: stivers_t at tomass.dyndns.org
> 
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> 
> 

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