Help very slow smtpd server

[Dale Anderson]

Hi all we been getting hit with email attacks. So I
added a recipients list to our smtpd server and now it
is very slow. Anyone work with qmail-recipients? Any
suggestion The firewall I am using is showing 
SYN flood attack dropped every min. What else can I
try. System is a FreeBSD 5.0 with Qmail maidir pop3 

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