Configure a Smart HostYou can route all outgoing messages for remote domains through a smart host instead of sending them directly to the domain. This enables you to route messages over a connection that may be more direct or less costly than other routes.
Note The smart host setting for SMTP virtual servers is similar to the one set on SMTP connectors. Microsoft recommends configuring smart hosts on the connector, because connectors can handle message delivery on a per-domain basis.You can identify the smart host by FQDN or an IP address (but if you change the IP address you need to change it on every virtual server as well). If you use an IP address, you must enclose it in brackets [ ]. Exchange checks first for a server name, and then an IP address. The brackets identify the value as an IP address, so the DNS lookup is bypassed.
To set up a smart host:
Related TopicsInstall an SMTP Connector