Spam fighting tools

[Fraser Campbell]

On Tuesday 06 April 2004 11:06, Henry Spencer wrote:

> > Unless I'm missing something the 5xx would still result in a message
> > going to the forged sender address.
>
> The 5xx is part of the SMTP protocol itself.  So it's seen on the guilty
> machine that's actually trying to send the mail, not the innocent one
> named on the envelope etc.  The spammers are not going to waste their
> machine resources by trying to do anything about it.

I realized the rejection is at the smtp protocol level.  That's fine if the 
spam is being sent direct to the recipients smtp server (using spam malware 
typically) but when a relay is involved (as one often is) I'd expect a bounce 
to be generated.

Am I mistaken in thinking that the "sender" gets a copy of 5xx errors?  I know 
for sure that 4xx errors (temporary errors) often get sent to the sender.  

I'd be very surprised to learn that permanent errors  (5xx) do not result in a 
bounce to the "sender".

-- 
Fraser Campbell <fraser-Txk5XLRqZ6CsTnJN9+BGXg at public.gmane.org>                 http://www.wehave.net/
Georgetown, Ontario, Canada                               Debian GNU/Linux
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