Ricardo Kleemann writes:
Hi,I was thinking of writing a filter module for DOS prevention. Basically it would check against bombs either from an IP or to a recipient, and essentially would either throttle (defer and delay) or reject. My question is, does courier already have something built-in for these types of DOS attacks? If not, I'll just write the module and contribute it to the list.
Courier will already do pretty well to block most bombs. The combination of limiting connections from the same IP address range, and automatic tarpitting of SMTP errors, will usually be enough for most cases.
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