You can create a configurable service that the EmailInput node or message flow refers to at run time for email server connection information, instead of defining the connection properties on the node or the message flow. The advantage being that you can change the host name and security identity values without needing to redeploy your message flow.
Use the EmailServer configurable service to change the email server connection information for the EmailInput node. The properties of the EmailServer configurable service are described in Configurable services properties.
Creating, changing, reporting, and deleting configurable services