[Mimedefang] DoS??

Jan Pieter Cornet johnpc at xs4all.nl
Mon Oct 17 16:00:14 EDT 2005

On Mon, Oct 17, 2005 at 03:21:02PM -0400, WBrown at e1b.org wrote:
> Thanks for everyone's input on this problem.  It turned out that they WAN 
> folks added a throttle on the firewall between the spam filters and the 
> DNS servers to limit queries to 100 per second.  Any additional requests 
> were just dropped, causing the IP stack to bog down. 

Maybe WAN folks have difficulty communicating with people that are too
nearby? :)

Anyway.. helpful hint: rsync or otherwise mirror your whitelists to a
local nameserver as much as possible, if you handle more than a decent
amount of email. And run a caching nameserver on every mailserver.

#!perl -wpl # mmfppfmpmmpp mmpffm <pmmppfmfpppppfmmmf at fpffmm4mmmpmfpmf.ppppmf>
$_[2]}->(map{/p|f/i+/f/i}split//,$&)+97):qw(m p f)[map{((ord$&)%32-1)/$_%3}(9,
3,1)]),5,1)='`'lt$&;$f.eig;                                # Jan-Pieter Cornet

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