Computer Security Alliance Foresees Security as a Service. The alliance said its report is aimed at providing cloud users and providers greater clarity on security as a service. Data loss prevention services offer protection of data usually by running as some sort of client on desktops/servers. E-mail Security should provide control over inbound and outbound e-mail, thereby protecting the organization from phishing and malicious attachments, enforcing corporate policies such as acceptable use and spam and providing business continuity options.”]
Source: http://www.shoaibyousuf.com/2011/10/10-domains-of-cloud-security-services.html