Question : POP3 Email / Spam Issues

We have a small network with 5 users collecting POP3 mail from an ISP using Outlook 2007 and have very large amounts of spam. I would estimate that for every legitimate email they receive they get 30 spam emails.

The ISP can offer little except tag the spam which means hundreds of spam emails still end up in the user’s junk folder in Outlook. This can acccumulate in thousands when the users can’t be bothered to delete them.

I would like to introduce a reasonbly inexpensive and simple Windows PC (XP or Win 7) based spam filter/mail server which would collect emails from the ISP and if detected as spam, would then move them to a  “quarantine area” where they can can be inspected and if necessary whitelisted and released to the users mailbox by a admin person.

It would be important that the Spam filter program could use DNS Blacklists from the Internet, Bayesian filtering and the facility to allow the administrator to whitelist and Blacklist.
 
Does anyone know of a program or configuration that could achieve this? Some of the dedicated UTM hardware devices can do this but the cost is prohibitive for a small business.

Thanks in Advance

Answer : POP3 Email / Spam Issues

http://www.spamcop.net/ may also have relevant services, could pull from the ISP then your clients pull from spamcop, uses your choice of emial in the "From" header etc.