On 2/27/2013 2:45 PM, francis picabia wrote: > Over 390 unique IPs simultaneously sent email at a gradual rate > using 3 sets of > compromised credentials.
Use postfwd or similar policy service to rate-limit the total recipients per account over some period of time. http://www.postfix.org/SMTPD_POLICY_README.html http://www.postfix.org/addon.html#policy http://postfwd.org/ -- Noel Jones