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Oldie but a goodie. Highly recommend reading this but if you don't want to..

SPOILER - though you should be reading the article first anyway if you care!

An accidental downgrade of Sendmail made Sendmail have a zero second timeout on sending mail that ultimately worked out at 3 milliseconds, just enough to hit servers within a certain radius..

I bet there are several pieces of software that could have a zero timeout triggered in a similar way. The difficulty of figuring it out? About the same as with this guy ;-)




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