Connection throttling POP3.

David S. Madole david at
Mon May 21 18:15:00 EDT 2007

> On Mon, 21 May 2007, Matthew Schumacher wrote:
>> List,
>> And this spammer is racking up a zillion processes which 
is killing 
>> my machine.  I need a way to throttle this somehow where 
he is only 
>> allowed one connection per IP at a time, or perhaps a way 
to ignore 
>> them after so many invalid passwords.
>> Anyone know of a way to do this?

If you are on Linux, you can do something like this, which I use for SSH for the same reasons:

iptables -A INPUT -p tcp --dport 22 \
         -m state --state NEW \
         -m recent --update --seconds 60 -j DROP

iptables -A INPUT -p tcp --dport 22 \
         -m state --state NEW \
         -m recent --set -j ACCEPT

This limits connections to once a minute.


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