Allen Coates:
[ Charset windows-1252 converted... ]
> To limit repeating offenders, you might like to try playing with
> 
> smtpd_client_connection_count_limit,
> smtpd_client_connection_rate_limit, and
> anvil_rate_time_unit

You can add smtpd_client_auth_rate_limit to that (Postfix 3.1 and later).
http://www.postfix.org/postconf.5.html#smtpd_client_auth_rate_limit

        Wietse

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