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Own db of blocked IPs

Hi there, 

I have an external DB of the IPs to be blocked. It is very dynamic (up to
100 new entries per minute) and centralized - many servers should use it. So
the standard Zmailer mechanisms of static blocked IPs are - I guess - no
good to me. I am running out of time, so please, help me with the following:
where in the smtpserver should I implement my lookup so that I can discard
the connection in either of the places:

 - in main smtpserver process, after accept() and before the fork
 - in the child smtpserver process

Please, help me if you can (and I know you do!) ;-) In the meantime I am
digging through the sources myself.

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