Option to Add Custom Code in the Exim Configuration Manager.
Go to Webuzo Admin Panel >> Email >> Mail Settings
Select the custom code option from the Exim Configuration Manager.
You can select the Header from the Dropdown List.
You can select the Rule from the Dropdown List.
Add the Custom Code in the Empty Section.
After Editing the Custom Code select the option "Add the Custom Code" to Save the Custom Code.
You can view the Custom Code from the View Exim Conf option Below.