Thanks Jason, but still confused as I want the email to be sent to the user that is logged in/subscribing and have tried various different codes in the "To" value as follows:
Setting a recordset and recalling that: <?php echo $row_Recordset1['UserEmail']; ?>
Session: <?php echo $_SESSION['eCartCheckoutForm_email']; ?>
Even To the Ecart Check Out form (which poputates from the user login details): <?php echo((isset($_POST["email"]))?$_POST["email"]:"") ?>
Each of these return the same error as previously mentioned.
I am sure I am missing something. but would appreciate a point in the right direction.
Actually just tested it using a static email address - mine and still get this error. So it doesn't seem to be an email address error - any suggestions?