SMTP DDoS

["Kip Sr." <kipsr1 () yahoo com>]

Hi everyone,

For the past 10 days, our mail exchange server has
been getting flooded with emails. It appears that an
attacker is sending out tons of spam through various
open relays and using our address
(sales () mycompany com) in the return path. so
essentially, all bounced emails are coming back to our
mail server - we're seeing about 30,000 NDRs per day.
I am using filters to delete the incoming email, but
does anyone else have any other ideas on how to get
this stopped? Since the NDRs are coming from
legitimate sources, checking for open relays wont do
me any good. 

Help!!!

Kip.









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