On Tue, Jun 01, 2004 at 06:52:00PM +0300, Stephen Biggs wrote:
>Thus, you have the situation of the spammer spewing out his garbage of 100,000 
>emails, each with the "joe-jobbed" email address, and then that person 
>getting back 100,000 replies (in your perfect world where everybody runs 
>challenge/response). Bogus.

Joe-jobbing is a problem whether C/R exists or not.  If someone decides to
send an email to 100,000 known bad addresses, and uses the your address
in the "From:", "Reply-To:" and envelope sender address, you're going to
get 100,000 bounces whether or not C/R is in place.

Any email system that returns error messages through email (including TMDA
and sendmail and postfix and MS Exchange and...) will cause joe-jobbing
problems.  True - C/R doesn't solve it.  But it's hardly the cause of it.
And, as others have noted, if everyone is using C/R in the same fashion
that TMDA works, then joe-jobs stop working altogether.

$.02
- Mark
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