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