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On Apr 2, 2007, at 17:08, Kurt Buff wrote:

> Do you receive mail from lists such as this one?
>
> Do you receive mail from non-responding mailboxes, such as network
> notificationss, etc.?
>
> Do you care about your new correspondents?
>
> If you answer 'yes' to any of these messages, then a Challenge/Respons
> system isn't a good idea for you.

TMDA is in the ports.  It is a challenge/Response system that can  
handle non-responding mailboxes.  You use one of its specially  
crafted addresses with those maillist servers etc.  They will come  
through fine.  There is no puzzle to solve though.  The originator  
only has to respond.