We just got the living daylights pounded out of us by a spam host running at 69.6.66.103.

While I know it can be easy to simply block the host, I was wondering if there was some way to avoid the problem all together by potentially identifying hosts attempting to overload the server (Denial Of Service) by throttling down the amount of allowed inbound connections (from external sources) from a single host.

Admittedly, this is a bit off topic.. Mimedefang.pl was the process that was getting hammered (and subsequently drove the CPU load to >16 before we shut down email all together), but I do not think that the fault lies with mimedefang (in fact, I don't think there is any 'fault' here).. it's more a configuration issue at the MTA level (in this case, sendmail).

-Rich
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