Spam Challenge-Response system

[Michael Torrie]

Brandon Stout wrote:
>> We should make some penalty for those that spam us. We should create a log of 
>> our most sent spammer IP's or something and post their email addresses on the 
>> internet...... Too bad most of the spam IP's are just open relays... :(
> 
> That's already been done.  They are called RBLs.
> 
> http://www.spamhaus.org/

And they are nightmare to get off of if you ever find yourself on the
list, either because of a misconfiguration (some lists have more than
just relaying hosts in them), or because of a mistake on someone else's
part.  I'm not convinced that RBLs are effective anyway.