How to configure an Exchange Server 2013 receive connector to allow internal and external SMTP for applications and devices in your network.
Proxying Outbound Email Through Exchange 2013 Client Access Servers
How to configure Exchange 2013 send connectors to proxy email through Client Access servers, and a demonstration of what results this option provides.
Configuring Outbound Mail Flow in Exchange Server 2013
How to configure outbound mail flow for Exchange Server 2013 using Send Connectors.
Manually Configuring DNS Lookups for Exchange Server 2013
How to manually configure the DNS servers used by Exchange Server 2013 for external lookups.
Exchange Server 2013 Mail Flow and Transport Services
This tutorial demonstrates the mail flow in Exchange Server 2013 and how the different server roles and Transport services are involved, compared to previous versions of Exchange.