Re: Why spam is a problem.

[Christopher Evans <teknopup at bigvalley.net>]

yeah okay, so I am wrong.   i was thinking of the spams i get from @hotmail.com 
that dont even seem to exist.    


8/13/02 3:45:07 PM, Keith Moore <moore at cs.utk.edu> wrote:

>> majority of spam emails are using forged addressing, propose that receiver 
smtp
>> server connect to the sending server and see if the server bounces on that 
users
>> address.
>
>I'm doing this now for one user community, with mixed results.  In particular,
>I'm surprised at the number of users whose email addresses are valid (in that
>if you send them mail, it will get there eventually), but for whom attempts 
>to validate their addresses via SMTP fairly consistently fail for temporary
>reasons (e.g. DNS timeout, SMTP doesn't respond, SMTP returns 4xx).
>
>Keith
>