Well. I have been looking for filtering appliances and have not seen anything that comes to even close to what I bought. Open source solutions being the worst of the punch. Messaging on the other hand. Postfix and send mail still are rock solid ones. If you need web interface, just add it on. If you need pop3/imap, just add it on.
What are the actual features you are looking at since for mail only, you have unlimited choices.
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KiXnet
