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Know more information about your network traffic than the NSA with Untangle Gateway
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A complete collaboration, messaging and e-mail server with Outlook MAPI support.
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An Open Source mail filter application for identifying spam messages on mail servers
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This project provides an Open Source anti-spam system for all Linux distributions
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An Email Security add-on for Mozilla Thunderbird. Simple, fast and effective.
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MailScanner is a free anti-virus and anti-spam filter protecting over 5 billion e-mails every week...