Dear FQ,

I recently got attacked with some dsl subscribers of this (imaginary) domain.

These subscribers present themselves as [ip].
Postfix SMTP server: errors from []

What I would like to do is to generate a list with all these dynamic ip addresses and provide them to my ipfw firewall in order to block them on the moment that they try to relay a 2nd time thru my server. This will cause less process time as it is quicker to send someone home by the doorkeeper (ipfw) rather than check his credentials first (Postfix) and tell him to get lost.

Is there any way to let postfix 'communicate' with my ipfw firewall?

Jos Chrispijn
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