> Have you considered using the greylisting module within pythonfilter?
> It's low in the resource usage stakes AFAIK, but is very effective at 
> stopping 90%+ of spam.

I'm using it after the dns black lists and yes it helps. But the real time
blacklists get the most spam, as it is my first line of defence. My problem
is that courier seems to wait until the smpt connection timeouts and is not
just closing the connection after sending the spammer, that his IP is on a
black list. And it seems to use one process per connection attempt. And as
most of the spamming computers are windows pcs which are controlled by a
spammer there are a lot of connection, which could just be closed after
sending a 5xx without forking or a least without waiting for a timeout
after sending that block message. 

-- 
Regards,
Robert
-----
Robert Penz

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