> >The problem here is that the spammer is sending out E-mail with the
> >customer's return address. The spam is being sent from other mailservers
> >to other mailservers, so it can't be filtered.
>
>Sure, I understand the issue.
>
>But maybe you didn't read my post in-depth. The filter is on bounce
>messages that do NOT contain a local token. So it is the very *fact* that
>the original impersonation is happening on remote mailservers that makes the
>technique work!
OK, let's try this again. :)
I send an E-mail from my mailserver to, let's say, someone at Ipswitch. I
use your return address.
Can you stop it? If it bounces, you can stop the bounce messages. But, it
is impossible to prevent me from sending that E-mail to someone at Ipswitch
using your return address. You can't filter E-mail you don't have access
to. <G>
-Scott
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