How to stop my users from spamming

From: Distribution Lists (no email)
Date: Fri Aug 01 2003 - 16:28:21 EDT

I recently offered a free webmail service on one of my servers, with
postfix as my MTA. But I have this nightmare vision whereby one day I
could have a user or users abusing the service and start sending out spam,
getting me into lots of trouble :)

Can you someone offer (or point me in the right direction) me some advice
on how best to guard against this

eg, is there any restrictions I can apply to a receipt list, like only
being able to send a set number to addresses ?

Thanks 

--
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