[horde] Restricting mail in Imp

[Kevin Konowalec]

Is it possible to throttle down the number of messages/recipients a  
user can send to?  We have had a bunch of cases of users logging in  
and spamming from our server (I won't get into the insanity that  
makes that possible in the first place) and want to be able to add  
constraints so that users can only send a certain number of messages  
over a certain period of time.  I'm being vague here cuz I don't know  
exactly what the powers that be want to be able to do... but if this  
is possible in Horde, either through some configuration somewhere or  
via a hack, I'd like to be able to tell them what was actually possible.