Email security solutions fall into three basic categories: software-based, appliance-based and managed services, known as Software-as-a-Service (SaaS). Key weaknesses of software-based and appliance-based solutions include difficulties in ensuring the solution stays up-to-date, major commitment of in-house IT resources, and ongoing investment in additional software/hardware, etc., substantially increasing total cost of ownership. By comparison, managed services offer many clear advantages: a clean email "pipe"; round-the-clock, constantly updated real-time protection; freeing up of in-house IT resources; and lower costs. Read this whitepaper for a buyer's guide to email security solutions that offer protection of business continuity, confidential data and brand image, effective implementation of company email policies and regulatory compliance at national, international, and global levels.