Spam filter

Hi, I'm using FreeBSD 6.2 with postfix/postfix admin/courier imap+pop3. Accounts are stored in a MySQL database, and I use maildirs stored in /var/vmail/

We're in the process of migrating our mail accounts over from Windows Server 2003 running IMail. As of now, we have a few hundred accounts, but expect significantly more in the future.

What I'd like to do is set up a decent anti-spam solution now, while we're small --- we already get a lot of it.

I'm open to other ideas, but what I have in mind right now is to set up something along the line of a spam filter that dumps junk mail in a folder called "spam" or "junk" for the users to check if they want to. I would prefer this to outright deleting spam, just in case something legit comes through. I presume that it wouldn't be heard to clean out such a folder; if the software doesn't already do it, I imagine a single crond script could be written to traverse the directories and delete messages older than 15 days during off-peak hours.

Given my configuration, what might be the easiest way to do this? I've actually been a little overwhelmed by my options, and am admittedly a little new to administering mail with postfix.

Thank you!
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