A POP3 client must authenticate to a POP3 server before they exchange information. You can set the types of authentication for the proxy to allow and the action to take for types that do not match the criteria. You can add, delete, or modify rules.
If you modified a predefined proxy action, when you save the changes you are prompted to clone (copy) your settings to a new action.
For more information on predefined proxy actions, see About Proxy Actions.
About Proxy Policies and ALGs
About the POP3-Proxy