Making Umbraco Courier publish on transfer

Add the following to your website's web.config file to have Umbraco Courier publish nodes automatically on transfer:

<configuration>
  <appSettings>
    <add key="CourierRepublish" value="true" />
  </appSettings>
</configuration>

This is particularly useful when nodes are being transferred from a production environment to a test environment as the content does not need to be reviewed before it is published.