To configure Microsoft's Entourage program for use with WCNet's authenticated mail server do the following. Go to the Tools menu and select Accounts.
In the edit window:

Change the Sending mail server to authmail.wcnet.org
click on the button Click here for advanced sending options
in the pop up window configure it as indicated in the below picture

You WILL get an error message when sending mail regarding the signing authority not being recognized. This is OK. You can continue to use the server as is and just acknowledge the message, OR you can install the root certificate for the signing authority. To install the root certificate go to the following web page http://www.wcnet.org/help/mac/smtpauth/cert.php