Which solution should you recommend a solution to encrypt all e-mail messages sent to the Internet?
You are the messaging engineer for your company. Your company has an Exchange Server 2007 messaging system. Your companys network has five Edge Transport servers. The Edge Transport servers handle all e-mail messages sent to and received from the Internet. Your company wants to implement a stricter e-mail security policy. You need to recommend a solution to encrypt all e-mail messages sent to the Internet. Which solution should you recommend?