From: Michael Nguyen (no email)
Date: Wed Dec 01 2004 - 04:19:37 EST
From: "Erwan David" <>
> Le Tue 30/11/2004, Michael Nguyen disait
[snip]
> > ..but I think this misses the point. If I send spam through my ISP's
mail
> > server, I'll get shut down in a very short amount of time. By leaving
me
> > with nowhere else to go, I restrict my ability to send out spam. I
don't
> > like breaking the Internet, but I do support this.
>
> You'll also get shutdown based on the originating IP, which can be
> retrieved from mail headers. Forcing the usage of ISP's mail server
> which is often blacklisted for having relayed its customers mails
> first time does not give anything.
This is horribly off-topic as it's not really Postfix related anymore so I
won't respond anymore to this but...
The only information you can truly guarantee as being legitimate is the IP
address of the relay... That is why we do blackhole lists...because in
reality, it's the only thing that we're 100% sure of. From addresses,
subject lines, X-Originating-IP headers....all of these things can be
forged. The only thing you know for sure is that your mail server received
a mail from a particular IP address and that information is indisputable.
Everything else is questionable.
It's not really fair to say that forcing the usage of an ISP's mail server
does not give anything as it forces a spammer to spam through a particular
path that is easily controlled because:
- the ISP controls the user's internet connection
- the ISP controls the user's SMTP access
- the ISP controls the user's billing information
Unless the user is bouncing from ISP to ISP with fake credit cards, that's
basically complete control over a spammer.
[snip]
Michael
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