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Let's try the hard way to secure our mailsystems. Not as convenient as using spamd and spamc is the approach mentioned in the postfix FilterReadme. Some guys at http://www.WorldDesign.com/index.cfm/rd/mta/spampd.htm have published a spamd replacement that works as a SMTP-proxy. The advantage over spamd/spamc is efficiency (no fork/exec()ed processes or temporary files required for failsafe operation) and the ability to use before-queue content filtering.
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