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From: dufresne at winternet.com (Ron DuFresne) Subject: Block notification / bounce mails (as in DDOS) On Thu, 1 Apr 2004, Koen wrote: > Luke Norman wrote: > >> > >> What do you all suggest to this 'seemingly' DDOS-attack (allthough not > >> intended as a DOS)? > >> > > Set up a server-side bayesian filter to block all e-mails containing > > certain words (such as 'address not found' or similar). I'd be very > > suprised if there isn't a filter like this already available if you > > google it. Have a look at the 'fighting useless notification mails' > > thread from a few days ago, which is a related topic > > This would be an option if the mailserver is still capable of handling all or > some of the mail. As the question was raised, this is not the case. The > 'theoratical' situation is that my mailserver is as dead as a doornail (not > really crashed but out of oxygen..network-bandwidth). > > Thanks anyway for the response (and yes, the thread on fighting.... is indeed > very helpful for the case where I have some 'spare' bandwidth) if the troubles is bandwidth exhaustion then you either get a bigger pipe, or are forced to work upstream to get the traffic sidetracked/blocked there. If the DDOS relates also or else to cpu/mem over consumption then you build a bigger server that can handle the loads in stressed times as well, or cluster smaller servers to do the same. Thanks, Ron DuFresne ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "Cutting the space budget really restores my faith in humanity. It eliminates dreams, goals, and ideals and lets us get straight to the business of hate, debauchery, and self-annihilation." -- Johnny Hart ***testing, only testing, and damn good at it too!*** OK, so you're a Ph.D. Just don't touch anything.
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