Spam Attacks

Eli Wapniarski eli at
Fri Sep 16 20:59:47 IST 2011

Correct, but thats not the only thing that you have to worry about. The shear 
volume of the slams will bring your mail server to a dead stop if its force to 
have to process the load. The slam attacks simply overwhelm your server. 
That's where great_pause for sendmail and postscreen for postfix and the 
method mentioned for fail2ban will handle this kind of attack much much 

On Friday 16 September 2011 22:10:04 Stuart Henderson wrote:
> On 2011-09-15, Eli Wapniarski <eli at> wrote:
> > Greylisting works great, but it still processes the mail. And eventually,
> > the bot will break through the timeout.
> Part of the idea of greylisting is that by the time spam makes it through,
> either the spam source will have been added to RBLs, or a similar-enough
> message will have hit spamtraps and picked up by some other method (pyzor,
> dcc, clamav unoffical sigs, etc), so that by the time it is received, it
> will be scored highly enough to be marked as spam.

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