Kerio MailServer is a secure, high-performance, multi-domain, mail server working with all POP3 and IMAP desktop mail clients for Windows, Linux and Mac. Dual anti-virus control provides administrators with the ability to use both the integrated McAfee Anti-Virus and one of several external virus scanning products (Avast, AVG, eTrust, NOD32, Sophos, Symantec) for stronger protection. A combination of content-based (SpamEliminator) and sender-based (SpamRepellent) anti-spam tools in Kerio MailServer significantly reduces the amount of unwanted email, helping to limit the legal hassles and security risks associated with spam.