To create confirmation rules, select the tab Autoresponder Rules and click Add rule. Establish what autoresponder will be sent based on what conditions. Autoresponders are managed by using the Edit button that appears on hover. In case none of the established rules is met, you can either choose the default autoresponder or a custom autoresponder to be sent.
You can add a rule that will not send any autoresponder to the form visitors. After setting the condition, use the option Do not send autoresponder, located in the dropdown list of the rule. When that particular condition is met, no autoresponder will be triggered on submission. This option can be even applied for the default autoresponder.