You have an Exchange 2010 organization. 
Your companys security policy states that all connections to Outlook Web App （OWA） must use smartcard authentication. 
You need to recommend a solution to meet the security policy requirements. 
Which two possible ways to achieve this goal should you recommend？（）

You have an Exchange Server 2010 organization. You deploy an Edge Transport server. 
You need to implement a message hygiene solution that meets the following requirements：
.Users must be able to receive e-mail from external recipients who have been added to their Safe SendersLists
.The Edge Transport server must block all e-mail sent to invalid addresses inside the organization 
What should you do first？（）