thanks Jason. I'll try that
BTW - can I ask a general question about UE4 incorporated in eCart.
when I edit the mail message, a file is created in the root folder, called something like confirm_WAUE_HTML_WA_Universal_Email_1.php
but the file in the server behavior is not the same. (waue_confirm_1.php)
is this confirm page created merely temporary, it seems like the waue_confirm_1.php builds the email.
which prompts a further question, is there any more detailed walkthrough/tutorial for UE, as it seems that there is a getting started guide, but not much else.