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Re: Getting open smtp servers fixed

  • From: Richard Kettlewell < >
  • Date: Fri, 11 Sep 98 14:27:55 +0100 (BST)

> What are the defenses?
> a) Make spam illegal, so that the penalty is a little bit higher than a
>    cancelled subsription.  But we have to be careful with what we wish
>    for -- someone's free speech will very much look like someone else's
>    spam.
> b) use "artificial intelligence" software to detect spam before it reaches
>    the user's mailbox.

c) filter out all port 25 tcp connections from dialup customers unless
   they are to yoru smarthost(s).

The spammer can still use the smarthost (much as if they were using an
open relay, of course) but you by forcing all the mail through a
single point the ISP can more easily detect the spammer early on.

Legitimate customers shouldn't mind being constrained to route all
their mail via your smarthost.  Nonetheless some ISPs might very well
feel unable to implement this strategy for whatever reason.


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