it comes back to the question of what is it you emailing.
Are you emailing an order receipt?
if that is the case, you would be emailing the order receipt prematurely, the order would not be processed yet.
if it is just a notice of a potential sales, then you could have your form submit to itself, use the eCart Set Session Value behavior to store each form element value in a session variable, send the email, then redirect to a second page that uses hidden form elements to mirror the original form, set each hidden form element to use the session variables as the values. and use java script in the body onload function to submit the form: