Add an Exchange Relay

To relay through exchange server the following receive connector settings should be used:

1. Set your Name and Port as needed.
2. Under security check ONLY: Transport Layer Security (TLS); Externally secured (for example, with IPsec); Exchange Servers; Anonymous Users
3.  From Scoping REMOVE the 0.0.0.0-255.255.255.255 range. (WARNING: Skipping this will create an open relay) and add Static IPs for approved senders.
4.  From PowerShell run: Restart-Service MSExchangeTransport
5. Test via Telnet and from outside

This is typically setup for Port 25 so adjust that connector.