>>> Les Mikesell <les@futu...> 09/06/2009 18:59 >>>
> Spammers are a lot smarter than that these days. If you watch your logs
> during a dictionary attack you are likely to see the messages come in
> from dozens of different IP addresses that are obviously coordinating
> the address space and timing so you don't see a big number of addresses
> come in from any single source, or on any single message, or fast enough
> to overwhelm a reasonable server.
Agreed, some are smarter - but there's enough of the old sort to make it worthwhile.
Recipient throttling, limits on the max number of recipients, etc are all worth doing - but for the specific case of a single server which tries a dictionary attack, MD is the place to trap for it.
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