[Greylist-users] machine gun

ed ed at ednevitible.co.uk
Sun Jan 29 04:16:28 PST 2006

On Fri, 20 Jan 2006 17:35:02 -0500
Matt Prigge <mprigge at pobox.com> wrote:

> Are the connections concurrent or sequential? There may be a way to
> introduce some delay into the SMTP conversation that would effectively
> slow things down and save you from getting entirely obliterated. Maybe
> something as simple as introducing a 15s delay in between the From:
> and To: on tripples that have been denied (and not accepted) more than
> X times (tunable of course). I don't imagine that would be hard to add
> to the code, but, depending upon what you're seeing, it may or may not
> help. The spammers are likely using threaded delivery engines, so that
> may not help there - the legit ones really shouldn't be trying to
> deliver the same message more than once at a time though. :-)

OpenBSD's spamd has a 1s delay per character response. That is only used
when RBL checking, when true greylisting they dont have the delay.

Regards, Ed http://www.usenix.org.uk
:%s/Open Source/Free Software/g

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