Where is the $email_text variable set on ubercart? With Ubercart, where is the $email_text variable set, the variable that determines whether the "do not reply to this email" should be displayed in the email received by a customer after they place an order.
It's set in template_preprocess_uc_order(&amp;variables) in the order module ($variables['email_text']). 

If you're looking to override this variable for your site it can be overridden by defining a function MYTHEME_preprocess_uc_order(&amp;variables) in your theme's template.php