The proxy examines the initial HELO/EHLO responses when the SMTP session is initialized. The default rules for the SMTP-Incoming proxy action make sure that packets with greetings that are too long, or include characters that are not correct or expected, are denied. 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 the SMTP-Proxy