You have an Exchange Server 2013 organization that contains one Client Access server named EX1 and one Mailbox server named EX2.
You have a perimeter network and an internal network. The perimeter network contains an Edge Transport server named EX3 that has Exchange Server 2010 installed.
You need to ensure that all of the email messages sent to and received from the Internet are routed through the EX3. Which three actions should you perform? (Each correct answer presents part of the solution. Choose three.)
Correct Answer: A,B,E
Explanation/Reference:
Explanation:
To establish Internet mail through an Edge Transport server, subscribe the Edge Transport server to an Active Directory site. This automatically creates the two Send connectors required for Internet mail flow:
A Send connector configured to send outbound email to all Internet domains.

A Send connector configured to send inbound email from the Edge Transport server to an Exchange

2013 Mailbox server.
SMTP traffic and ports TCP 50636 must be allowed between the mailbox server (routing service) and the Edge server.