For example, to ensure that you always receive SMTP connections from a partner site's SMTP server:
Create an Address Object for the server using the Add icon. The Add User-Defined SMTP Server dialog appears.
Click OK. The Address Object is added to the RBL User White List in the User-Defined SMTP Server Lists table.
To delete a White List Address Object, click the triangle icon of RBL White List row and click Delete Icon.