I recently got attacked with some dsl subscribers of this (imaginary)
These subscribers present themselves as [ip address.dynamic.some.net].
Postfix SMTP server: errors from 66-66-66-166.dynamic.some.net
What I would like to do is to generate a some.net 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?
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