Jan-Kaspar M?nnich:
> On 26.05.2010, at 21:01, Matt Hayes wrote:
>
> >> Is there
> >> something more I can do to mitigate the stress on the server?
> >
> > You could look into using RBLs such as spamhaus etc.
>
> In general RBLs work fine against these dictionary attacks. But
> in this special case where not one address exists at the targeted
> domain, I doubt that RBLs would decrease server load, since that
> would add one more DNS lookup. I wouldn't see a big problem there,
> even thousands of 554s normally don't stress Postfix too much.
With postscreen (Postfix 2.8) RBL lookup happens before SMTPD
so it takes away system load.
Wietse
