Your network contains a single Active Directory domain. 
You have an Exchange Server 2010 organization that contains a Hub Transport server named Hub1. Hub1 receives all e-mail messages that are sent to your organization from the Internet. 
A new company security policy states that domain-joined servers must not be accessible directly from theInternet. 
You need to create a message hygiene solution to meet the following requirements：
.Comply with the new security policy
.Minimize the amount of spam that is delivered to the internal Exchange servers in the organization
What should you do first？（）

You have an Exchange Server 2010 organization. 
Company policy states that a copy of a users mailbox must be kept for one year after the user leaves thecompany. 
All user accounts are in an organizational unit （OU） named OU1. 
A compliance administrator plans to export the mailboxes to personal folders. 
You need to recommend a solution that allows the compliance administrator to meet the requirements ofthe company policy. 
What should you include in the solution？（）