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Vote for Kerio MailServer
Kerio MailServer is a secure email server for SME, which features anti-virus control, integrated SpamAssassin, and encrypted mail protocols. KMS provides shared address books, public mailboxes and mailing lists for workgroup collaboration, and full integration with Microsoft Active Directory and Apple Open Directory for user management. Available with integrated McAfee Anti-Virus and Kerio Fax Plug-in, KMS runs on Mac OS X, Windows and Linux.