Vote for mxOrb

This spam filter includes: Whitelist for email addresses that should never be blocked. Blacklist for email addresses that should always be blocked. Support for multiple DNS and RHS blacklists to ensure the majority of unwanted messages are blocked. Powerful content filtering for message subject, text and HTML body checking. Attachment filename and content type filtering to block potentially dangerous attachments before they reach your users. Statistics gathering and debug logging to assist in monitoring and troubleshooting. Graphical configuration tool for customising settings with detailed online help.

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