On 05/07/2012 05:52 PM, Sam Varshavchik wrote:
> There's nothing there that can be readily used for something like 
> this. I suppose one can hack up a perlfilter script that counts 
> messages from each authenticated user. 

In addition to fail2ban, which I believe would work reasonably well, 
pythonfilter has a rate limiting module.  It currently limits by IP 
address, but changing just one line would allow you to rate limit users 
instead:
http://phantom.dragonsdawn.net/~gordon/courier-pythonfilter/courier-pythonfilter-1.7/filters/ratelimit.py
http://phantom.dragonsdawn.net/~gordon/courier-pythonfilter/

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