Gartner describes vendors in the leaders quadrant as follows: "Leaders are performing well today, have a clear vision of market direction and are actively building competencies to sustain their leadership position in the market. Companies in this quadrant offer a comprehensive and proficient range of email security functionality, and show evidence of superior vision and execution for current and anticipated customer requirements. Leaders typically have relatively high market share and/ or strong revenue growth, own a good portion of their threat or content filtering capabilities, and demonstrate positive customer feedback for anti-spam efficacy and related service and support."