(b) If there is no internationally agreed-upon means of service, or if an international agreement allows but does not specify other means, by a method reasonably calculated to give actual notice of the proceedings:
2. As the foreign authority directs in response to a letter rogatory or letter of request; or
3. Unless prohibited by the foreign country’s law, by:
b. Using any form of mail that the clerk addresses and sends to the party and which requires a signed receipt.
