Well there is a superior alternative that is regularly updated, free, and open source. It's called Nessus, and it is by far the best scanner available. Dave Wreski and Rich Jankowski interview Pete Herzog, the creator of the project to gain insight to the development efforts and the hope for adoption into the industry. Over the past several years the Honeynet Project has been dedicated to learning and the tools, tactics, and motives of the blackhat community and sharing the lessons learned. The primary tool used to gather this information is the Honeynet.
Many people have no problems sending sensitive data via e-mail.
Most of us do not know how easy it is for anybody to read it.