I do not have such a transaction type in my account, create a new one:
If you want a sample mail to be triggered, download the template here.
Upload the template to your account, create a mailing based on it and activate it to be sent on occurance of the above configured event. Then a mailing like this one will be sent to you.
Please make sure the email address exists in your Maileon account and has a valid permission (= not NONE).