> Since early hours of Oct 31, our mail server is experiencing mail flood
from
> a variety of IP addresses spread throughout the world. The mails are
coming
> to anyname@ourdomain.com. Thus our server is receiving them as domain name
is
> valid. However they are building up in the queue for directory lookup as
the
> names are invalid. Yesterday, we received about 3500 emails per hour. The
> rate has come down to about 20 per minute since we rebuilt our denied IP
> address list.
>
> What else can we do to stop this siege on our mail server?