Here is the premier corporate email protection tool. The install file, a 45 day trial license, careful instructions how to apply license and a 400 page book about how to operate the Ironport ESA.

Industry-Leading Email Protection

Keep your critical business email safe from spam, malware, and other threats. The industry-leading solution gives you faster, more complete email protection to stop email-based threats and provide continuous protection before, during, and after an attack