>  It's a map file from the basic IMGate config Len emailed me back in
>September.
>
>I use to blacklist unknown local recipients greped from the maillog.

wrong use

>Under "smtpd_client_restrictions" I have
>hash:/etc/postfix/to_recipients_bw.map
>
>Am I not using it as intended?

it's not to be used for stopping dictionary attacks, but for rejecting mail 
to specific accounts.

you don't seem to have much volume, so try using reject_unverified_sender. 
see the postfix VERYIFY README

Len




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