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?()