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Vote for Mailscan
MailScan is a Content Security Software that performs content filtering and virus scanning of the system. With MailScan's technology that creates a layer, termed as MicroWorld WinSock Layer (MWL), any traffic that comes into a company's network is scanned for security violations.
MailScan for Mail-Server acts like a "Transparent Gateway" between the Corporate Mail Server and the Internet. All mails must pass through MailScan. This ensures maximum security in delivering messages.