Hi,
It is more an "non feature" than a bug/issue.
By default in the IPN (payment notification), the plugin does not enable the user notification by email.
Only when the payment is confirmed, the notification for the user is requested.
But you can see to edit the eWay rapid plugin and replace that content :
if(count($errors) == 1 && $errors[0] == 'D4406' && isset($_GET['user_cancel'])) {
} else {
By
if(count($errors) == 1 && $errors[0] == 'D4406' && isset($_GET['user_cancel'])) {
$history->notified = 1; // Notify customer
$email = true; // Notify administrator
} else {
To activate the emails (and you can remove one of the lines to not send one of the emails).
Regards,