for about 6 months on a Windows gateway and recently moved it to a new Linux box. So far, working really well and provides a number of protection features for your internal mail server.
I also just added MailScanner to the Linux box for added protection against phishing attacks so you may want ot look at that as well.
I used qmail with qmail-scanner, spamassassin and clamav. It did an excellent job of filtering out spam and viruses. You need to decide which MTA to use...postfix, qmail or sendmail (not recommended).
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