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DoS attacks (was Re: SMTP Transferred-By-Reference)

2007-11-15 15:05:55

Arnt Gulbrandsen wrote:


There was an excellent article in the magazine iX on the subject earlier
this year, illustrated with a number of depressing rrdtool/mrtg graphs.
Dreary reading. Very brief summary: 1. Spammers whose botnets span n
hundred thousand boxes can shovel more mail onto your MXes than they can
handle. 2. Sometimes they do. 3. When they do, that's no fun at all for
the sysadmins on the receiving end.

Yeah, I know, but spammers can do that with or without content-filtering.
Sure, they'll overwhelm you a bit sooner if you use content-filtering
than if you don't, but that's about it.