GreatHorn is a company that provides email security solutions to detect and stop spear phishing attacks before data breaches occur. Their solutions include homograph detection, behavioral analysis, content compliance, and DNS heuristics spoofing detection. GreatHorn has seen significant growth, protecting over 16 million emails and generating over $1 million in qualified sales opportunities in 2016. They are offering a 30 day free trial of their basic monitoring solution to interested companies.