I've switched company from old boring but well working Blue Onyx with anti-spam package ( SUN Cobalt open source) server to Zimbra. Many useful features, but spam filtering features are premature and malnourished‎. Found old posts on adding Razor and Pyzor manually, but don't want to lose customizations when new upgrade comes, don't want to add any repos, not having good times with spamassasin config file, luck of current documentation etc...
does network version differs from open source? any good write-ups on getting spam under control?