Re: ISP port blocking practice

[John Levine <johnl () iecc com>]

> That's really the question at hand here -- whether or not there's any
> benefit to continuing the "never ending arms race" game.  Some people
> think there is.  Others question whether anything is really being
> accomplished.  Certainly we're playing it out like an arms race -- ISPs
> block something, spammers find a new way to inject spam, and so on. 
> The end result of lots of time spend on blocking thins, less
> functionality for customers ... but no decrease in spam.

I take it you've never run a mail system other than perhaps a tiny one
for your friends.  The alternative to the arms race is to abandon
e-mail altogether.

> The theory behind closing open relays, blocking port 25, etc., seems to
> be:
> (a) That will make it harder on spammers, and that will reduce spam --
> some of the spammers will find other other ways to inject spam, but
> some will just stop, OR
> (b) Eventually, we'll find technical solutions to *all* the ways spam
> is injected, and then there will be no more spam.

Interesting guesses, but wrong.

R's,
John